Knife Review: Extrema Ratio K-TALON

Extrema Ratio’s K-TALON is an elegant, super-slim karambit knife with a fixed, hooked hawksbill blade and grip-ring. K-TALON comes in two versions of blade finish, Dark Stone and Stone Washed, both shown in this review and the video.

This review of the Extrema Ratio K-TALON includes an in depth video with overview and detailed measurements, plus image galleries and more..

Detailed Video Examination

This video takes a detailed look at the K-TALON and also includes some tips on fitting an Ulti-Clip to the K-TALON’s Kydex sheath.


A few more details:

What’s in the box?:


A good look round the K-TALON sheath – Things to look out for here are:
Included in this review are the two optional clips; the Ulti-clip slim and the belt clip. The K-TALON’s sheath is slim, made from Kydex and has a drainage hole. The blade retention can be adjusted via the two fastenings at the mouth of the sheath. Out of the box, the sheath has a paracord neck lanyard. The Kydex is held together with hollow rivets and along with slots provides a variety of mounting/fixing options.


A good look round the K-TALON – Things to look out for here are:
K-TALON has a very slim profile and the grip-ring is generous enough to allow for gloved hands. This gallery shows the dark stone blade finish close up. The elegant curved blade has a fuller and the finish is beautifully precise.
Despite the very slim handle, the distinctive Extrema Ratio grip pattern is clearly evident – no mistaking this is an Extrema Ratio.


The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.

The blade is made from N690 steel.


The Factory edge up close:

Followers of Tactical Reviews will know my views on factory edges, but to recap:

Anyone using a knife will need to sharpen it. That first factory edge is just like the first tank of fuel that a new car comes with (or first charge of the battery).
A good factory edge is a ‘nice to have’ but not a ‘make or break’ for a good knife, as you will be putting your own edge onto it soon enough.
The factory edge does however indicate the care a knife maker has put into the final finish.
It is for this reason Tactical Reviews measures factory edge sharpness and specifications, and includes this information in the detailed technical testing.

As a further look at the factory edge, this section has been added to include some high magnification photos of the factory edges.


What is it like to use?
A hook-bladed karambit is typically associated with tactical uses and less so for general EDC. Actually in its more typical tactical usage scenario you would actually not use it for every day cutting; the condition of the edge needs to stay at its absolute sharpest for an instance when it is needed in an emergency.
I am not looking at it from this tactical point of view, but instead as an EDC blade. The hooked, hawksbill blade was initially developed as a utility knife and farming tool in Malaysia and the Philippines during the 11th century, so is very functional for certain types of cut.

As a utility / EDC knife, a hawksbill blade is very well suited to cutting cords, stripping wires, pruning plants, and cutting carpet or other sheet materials.

Though the profile is so slim, the K-TALON handles very well.


Although in this gallery I have only shown grips that use the grip ring, you can ignore the ring and just hold the handle without putting a finger though (see below). This gives even more positions to hold the K-TALON.

The karambit hawksbill curved blade works really well for some but not all tasks. Where it excels is in those cutting jobs where the curve of the blade can capture and control the cut. Cuts where a straight blade might slip off, or struggle to get purchase, the hawksbill blade grabs hold. In these instances the cut becomes much more controlled. In terms of EDC, as long as it is partnered with a straighter blade, the K-TALON makes for an exceptional addition in cutting power.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________
What doesn’t work so well for me
_______________________________________________

It is too big to be a ‘neck knife’.
No belt clip supplied as standard.

_______________________________________________
Things I like
_______________________________________________

Excellent handling.
Grip ring is large enough for use with gloves.
Choice of two blade finishes.
Easy to carry due to the very low profile.
Adjustable tension sheath retention.
Easy to fit and adjust belt/clip attachments.

 
Discussing the Review:
The ideal place to discuss this review is on the Tactical Reviews Facebook Page
Please visit there and start/join the conversation.

Knife Review: Extrema Ratio SATRE – Special Report

The Extrema Ratio Satre is a pocket-sized, light and extremely tough fixed blade knife, designed in collaboration with Daniele Dal Canto, a Master Advanced F.I.S.S.S. instructor. In this special report review of the Extrema Ratio Satre, I am able to carry out a special set of tests to quantify the edge apex stability (resistance to rolling) in a direct comparison of the two steels the Satre is available in, N690 and S600, as I have all three versions of the Satre available to test, the standard Black and Satin (N690) and the S600 version at an super hard 64 HRC. This special report also include two videos, an overview and detailed measurement, plus one showing the steps of the edge stability testing (SET – Structural Edge Testing).

Video Overview

This video is a detailed look at the three SATRE Models, from handling to technical measurements, hopefully something for everyone.


A few more details:

The videos show all three versions, but as the dimensions, shape and function are all identical, the galleries here show the standard Black Satre.

What’s in the box?:

As well as the knife in a bag with desiccant, there is a QC certificate, care instructions and warranty information.


A good look round the Sheath – Things to look out for here are:

The small and neat Kydex sheath arrives with a neck lanyard, nicely laced through the eye rivets that hold the Kydex halves together. These eye rivets allow for other mounts to be fitted such as the ULTICLIP. The sliding adjustment toggle also serves as a safety break-away. There is a drainage hole at the blade tip on one side.


A good look round the Knife – Things to look out for here are:

The Satre knife consists of a single piece of steel with no other material attached to it (ignoring the small cord lanyard). Despite that simple construction, Extrema Ratio have managed to pack it full of character and clearly identify it as one of their designs. The distinctive first finger grip is shaped into the tang along with the small cut out for weight reduction. Plenty of jimping is provided for various grips.


The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.


Structural Edge Testing:

Added in 2019 are results from the Edge On Up Structural Edge Tester (SET) to measure the resistance of a knife’s edge to rolling.

The key factors for the SET results are:
Series 1 Degradation – how much damage the edge suffers from one edge rolling cycle. The damage is represented by an increase in the BESS ‘C’ score. (Averages also shown for A and B)
Series 2 Degradation – how much damage the edge suffers from one further edge rolling cycle. (Averages also shown for A and B)
Degradation after strop – has the edge been permanently damaged/chipped or can it be recovered with stropping? A negative number means it actually improved from the starting figure, suggesting there may have already been some rolling of the edge before testing. (Averages also shown for A and B)

First a video of the testing process, then the table of results.


The following results do show a clear increased resistance to edge rolling for the S600 steel. In fact after two ‘series’ the edge has rolled only a similar amount to the N690 blades have after one ‘series’. This is a clearly stronger and more stable edge apex.
Often this extra resistance to edge rolling can be coupled with a more brittle edge, yet the S600 recovered better than the N690 after stropping. (If it was brittle the edge can chip when stropping and give a high BESS measurement.)
In this table, are the individual results for all three, plus a combined N690 set of totals at the bottom.
The figures in bold in the first column are averages for the single measurements.


The Factory edge up close – NEW FOR 2022!:

Followers of Tactical Reviews will know my views on factory edges, but to recap:

Anyone using a knife will need to sharpen it. That first factory edge is just like the first tank of fuel that a new car comes with (or first charge of the battery).
A good factory edge is a ‘nice to have’ but not a ‘make or break’ for a good knife, as you will be putting your own edge onto it soon enough.
The factory edge does however indicate the care a knife maker has put into the final finish.
It is for this reason Tactical Reviews measures factory edge sharpness and specifications, and includes this information in the detailed technical testing.

As a further look at the factory edge, this section has been added to include some high magnification photos of the factory edges.

In these galleries are each of the three versions with a before and after SET testing image. The edge rolling is just visible, but not easy to see.

Black N690


Satin N690


S600


What is it like to use?

It’s just one of those superbly useful knives. An easy size to carry and use, or keep as a backup. The size of the knife is similar to a medium sized folder, but being a fixed blade makes it super tough and a real working blade.
Here I’m showing it in an un-gloved hand (a hand which takes XL size gloves). It is compact, and doesn’t fill my hand, but the finger groove provides a really secure grip with the jimping (especially the thumb jimping) giving confidence.


With it being a compact blade and one without handle scales, the knife is capable of much harder work than you can comfortably manage with the bare blade tang in your hand. This design keeps it very low profile and really does make carrying and storing as a backup so much easier than a knife with wider handle.

Either in the pocket, or hanging around your neck the Satre is slim and unobtrusive. I can make this comment, not just based on one example but on all three – the Kydex action is spot on. The sloped shoulders of the sheath are just right to push on to release the knife, and the blade clicks out without a fight. This action is almost identical across all three and holds the blade securely without struggling to sheath or unsheathe it.

As seen in the SET testing section and video, the S600 steel is noticeably tougher. As with any higher hardness and higher wear resistance steel, you will notice the S600 is much more difficult to sharpen, and will need a suitable sharpener. This always makes for a dilemma for field use for me. As much as I love a longer lasting edge, if I might need to rely on one knife and might need to sharpen it in the field I would want to be able to sharpen it more easily and if required with natural stones rather than specialist sharpening equipment. This is just a consideration, as for many the longevity of the edge it already has may be more important than being able to sharpen in the field.

With a blade this thick (compared to its length) it doesn’t slice as well as a finer pocket knife blade would, but this blade is one you know won’t let you down if you need to work it hard. If you put one aside as an emergency backup blade, you know it is going to serve you well.


Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________
What doesn’t work so well for me
_______________________________________________

Pocket clip not supplied as standard.
Blade is relatively thick which affects slicing ability.
S600 steel much harder to sharpen (the cost of its higher hardness and wear resistance).

_______________________________________________
Things I like
_______________________________________________

Choice of blade steels.
S600 steel edge is measurably more stable.
Kydex sheath ‘action’ excellent.
Slim and low profile making carry easy.
Pocket or lanyard carry options.
Very secure grip.
Super strong design.

 
Discussing the Review:
The ideal place to discuss this review is on the Tactical Reviews Facebook Page
Please visit there and start/join the conversation.

As well as the Tactical Reviews Facebook Page, please consider visiting one of the following to start/join in any discussion.

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Knife Review: Extrema Ratio Panthera

The Extrema Ratio Panthera is a further development of their T-Razor (that was based on the traditional straight razor) and maintains all the characteristics of the T-Razor, but with a new wharncliffe blade shape and curving claw-like appearance. In this Extrema Ratio Panthera review, I cover all the technical specifications, detailed galleries to show you all the details, a video overview and demonstration of the opening method.

Video Overview

This video is a detailed look at the Extrema Ratio Panthera, from handling to technical measurements. Hopefully something for everyone and you should have a better idea if you should also pick one up.


The packaging:


A good look round the Panthera – Enjoy all the details:


The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.

The blade is made from N690 steel.


The Factory edge up close – NEW FOR 2022!:

Followers of Tactical Reviews will know my views on factory edges, but to recap:

Anyone using a knife will need to sharpen it. That first factory edge is just like the first tank of fuel that a new car comes with (or first charge of the battery).
A good factory edge is a ‘nice to have’ but not a ‘make or break’ for a good knife, as you will be putting your own edge onto it soon enough.
The factory edge does however indicate the care a knife maker has put into the final finish.
It is for this reason Tactical Reviews measures factory edge sharpness and specifications, and includes this information in the detailed technical testing.

As a further look at the factory edge, this section has been added to include some high magnification photos of the factory edges.


What is it like to use?

One of the distinctive features of the Panthera (and its sibling the T-Razor) is the extended tang used as the blade opening lever. This is the same style as with a friction folder (which being of Roman design actually predates the straight razor by around 1600 years), and allows both opening of the blade, and holding it in the open position. The Panthera also has a liner lock, so the tang is not used to keep the blade open, only to open it in the first place.

Of course the other striking design feature is the curved claw-like blade used in the Panthera, which makes it stand out.

It’s a big knife. I take XL size gloves and the Panthera is a real handful, just take a look at this set of photos.


The opening method is shown a few times in the video at the start of this review, but here are a set of photos to step through opening the Panthera using the T-Razor speed style of opening.


Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________
What doesn’t work so well for me
_______________________________________________

No pocket clip.
No case or holster (in lieu of a clip).
Tang opening doesn’t suit everyone.
Lock release is a bit sharp to push on.

_______________________________________________
Things I like
_______________________________________________

Striking and impressive knife.
Curved blade can increase cutting power for many tasks.
Very comfortable grip.
Blade opens quickly (once you are practiced).
Long handle allows for multiple grip positions.
Matte anodised handle finish feels great.

 
Discussing the Review:
The ideal place to discuss this review is on the Tactical Reviews Facebook Page
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As well as the Tactical Reviews Facebook Page, please consider visiting one of the following to start/join in any discussion.

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Knife Review: Extrema Ratio T4000 C

Included in this review of the Extrema Ratio T4000 C, a compact classic Tanto with Extrema Ratio’s tactical sheath and handle, are a video with an overview and detailed measurements, galleries of the packaging, sheath, and knife, plus insights into how it is to use.

Let’s take a closer look.

The video tour of the T4000 C:
In case you haven’t seen the video overview and vital statistics of the T4000 C on Tactical Review’s youtube channel, here it is. This video covers a quick tour of the knife and sheath and a detailed technical measurements section.

A few more details:

What’s in the box?:
For the T4000 C, it ‘just fits’ into the box. The usual Extrema Ratio high quality two-part box is used.


A good look round the T4000 C’s Sheath – Things to look out for here are:
Even though ‘Compact’ the sheath manages to fit in a lot of features and details. Solidly constructed and made to fit the compact knife perfectly. On the back is a set of PALS/MOLLE webbing and strap, with the front also having webbing for mounting a small pouch or other item. A gap in the welt at the base of the sheath allows for free flowing drainage. To comfortably accommodate the thick blade stock the welt is similarly sized.
A strong double press-stud retaining strap wraps the handle and keeps the knife securely in place. you can adjust the position of the retaining strap as it is held in place with a Velcro adjusting system. There is an anti-catch smooth plastic insert backing the sheath to prevent wear and damage to the back of the sheath when sheathing the knife.
With there not being a specific belt loop, using the MOLLE strap, you can make your own belt loop to fit the size of the belt.


The T4000 C knife itself:
From the first view of the satin blade emerging you get drawn into admiring the knife. The beautifully executed fuller on each side of the blade enhances the lines. Extrema Ratio’s distinctive grip design provides an index finger groove to give a strong grip. A single bolt holds the rubber grip in place on the full tang, that extends through to a striker and lanyard hole. Sharpening choils – what is your take? – well the T4000 C does not have one, so the sharp edge stops just short of the plunge line. Also note a front lanyard hole, allowing you to fit a cord to both the front or rear of the handle.
Being the compact model, the handle length sits just within the hand (I take XL size gloves).


The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.

There is a lot to take in here. These measurements are shown in the video.


What is it like to use?

It’s a tanto – nice – I always like a tanto. There is a practicality of having an almost chisel-like tip and what I refer to as the secondary point (where the tip and main edge meet) for various cuts instead of using the actual tip of the knife.
The elegant lines are simply a pleasure to look at as well as to use, and being the compact knife class from Extrema Ratio this is a really useful day to day blade. Something you are more likely to pick up and use, as it is very practical.

I knew after measuring the factor edge I would want to re-profile the edge bevel, 25DPS is too wide/heavy for a small knife, even 20DPS would be more than I want. But before doing this, with the sharpness measuring a respectable 281 BESS average I wanted to see how it fared. It would not shave arm hair with this edge, however…

Factory edge put to some minor fire prep tasks. The wood here is fully seasoned so much harder than any green wood. Kindling and feather sticks, perfectly good with these little pieces of wood, using the edge out of the box.

After a bit of use, it was time to change the edge bevel to 17DPS and bring that cutting edge a bit closer to the plunge line. As always, putting your own edge on a knife makes all the difference, and now it sings along shaving and slicing ferociously.

Extrema Ratio are good at Tantos, and this is one of their best. The thinned down blade thickness with full flat grind give it great slicing power, yet the blade still starts at 4.1mm at the spine, so is plenty strong for heavy use. Go back and look at the blade in the video as the light plays off it and you really appreciate the qualities of the T4000 C.


Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

I’m trying something slightly different and starting with what doesn’t work so well, so I can finish on a more positive note

_______________________________________________
What doesn’t work so well for me
_______________________________________________

No sharpening choil – personal preference.
Retaining strap is a bit bulky for a compact knife.
Factory edge usable but a bit ‘heavy’.

_______________________________________________
Things I like
_______________________________________________

Build quality and finish.
Practical well designed sheath.
‘Handy’ size being a ‘C’ Compact model.
Very comfortable grip.
Front and rear lanyard points.
Elegant blade profile with fullers.
Reliable steel choice.

 
Discussing the Review:
The ideal place to discuss this review is on the Tactical Reviews Facebook Page
Please visit there and start/join the conversation.

As well as the Tactical Reviews Facebook Page, please consider visiting one of the following to start/join in any discussion.

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

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Knife Review: Extrema Ratio Sethlans

Back when it was launched, I took a ‘first look’ at the Extrema Ratio Sethlans knife. Now, after being able to use the Sethlans for several months I can bring you this much more detailed look at the knife and its comprehensive equipped sheath.
The Sethlans is designed to be used for bushcraft, survival, and as a backup blade, so is also ideally suited for prepping, but I can tell you know, you are definitely going to want to use this knife.

The ‘First Look’ Video:
Taking you back to the initial impressions and overview of the Sethlans.


What’s in the box?:
Extrema Ratio knives always come in a nice robust presentation box.


A good look round the Sethlans Sheath – Things to look out for here are:

A good sheath can make or break a knife, as access to, and ease of carry, affect your experience of using the knife. The Sethlans has one of the most comprehensively equipped and well thought out sheaths of any knife I have used, and there are so many details to show, it is a major part of this review. The following gallery takes you through the construction, assembly methods and components of the sheath, including the sharpening stone pouch and fire-steel that come with the Sethlans.
This sheath can be fully disassembled and reassembled either as a left-handed setup (It comes as a right-handed setup), or stripped down to the very basics. You can run this sheath as just the Kydex sheath with no hanger, or the Kydex sheath with belt hanger/Molle mount. Super flexible design.


The Knife:
This gallery seems rather small after the sheath rundown. The Sethlans is a simple and elegant design that manages to incorporate the distinctive Extrema Ratio finger grip styling and take this feature yet further into the shaping of the actual tang within the grips where the metal is thinned down in the finger grip section of tang to mirror the grip shaping. Very nice touch.


The Blade and Handle – Detailed Measurements:
For full details of the tests and measurements carried out and an explanation of the results, see the page – Knife Technical Testing – How It’s Done.


What is it like to use?
Being an Extrema Ratio knife, the Sethlans seems to be both typically characteristic of the brand, yet at the same time completely different and surprising. It also has me in a dilemma about how to set it up thanks to the super flexible sheath design.
If I were packing in a ‘prepping’ style, I would leave the full Sethlans sheath setup with the sharpening stone and fire-steel, as like this you have all the bases covered. However as I am enjoying using this knife, and with the sheath pared down to the minimum, for me it is a much nicer every day carry. In this setup, I remove the pouch with sharpening stone, the fire-steel, and the handle retaining strap. This leaves the knife securely in the Kydex holder on a belt loop hanger.
The knife immediately feels at ease in the hand, comfortable, well balanced and agile. The grip is relatively slim for an Extrema Ratio knife, and this adds to the mobility and control for fine work.
Thanks to the thick full tang, the weight feels like it is in your hand, and the knife will just sit balanced on your first two fingers without trying to fall forwards.


The way the edge sweeps up towards the tip, gives you something similar to a chisel that you can use for nice controlled cuts by pushing down into whatever you are cutting. This same shape also works well as a skinner.
Areas of deep, wide and grippy jimping make for a very stable hold, and there is also the Extrema Ratio distinctive finger groove I have always loved.

Between the thumb jimping and swedge is a section of the blade spine that has been given a nice crisp edge, just right for scraping sparks off the big fire-steel. It does this very nicely indeed…


Fire-steels always make a mess that looks much worse than it is. The Sethlans cleans up perfectly after a fire lighting session, and the photo below, after a clean, left a knife looking as good a new. Use it!

Despite the significantly thick blade tang, the blade itself has a thickness of 3.9mm combined with a depth of 37.5mm, and this makes for a 5 degree primary bevel angle. The figures might be a bit of a yawn, but what it means is a blade that slices really well thanks to the small bevel angle – yet at a maximum thickness at the spine of nearly 4mm, is still a good strong blade without feeling heavy.

Extrema Ratio have put a lot of effort into the complex shaping of the blade, tang and handle fittings, and it shows. These design details make the Sethlans one of those knives you pick up and virtually forget about while using it, as the tool becomes an extension of your hand. You focus on the job, not the tool.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________
What doesn’t work so well for me
_______________________________________________

The Kydex sheath has a bit of side to side play due to the strap layout.
Reconfiguring for left-handed use requires full disassembly of straps and sheath bolts.

_______________________________________________
Things I like
_______________________________________________

Excellent balance of the knife.
Comprehensively equipped sheath.
Sheath can be reconfigured for left-handed use.
Modular sheath allows user to choose favourite setup.
Very good handling and grip.
Strong but slicey blade profile.
Easily strikes showers of sparks from a fire-steel.
Compact package.
Secure blade retention, yet easy to remove using thumb pressure.

 
Discussing the Review:
The ideal place to discuss this review is on the Tactical Reviews Facebook Page
Please visit there and start/join the conversation.

As well as the Tactical Reviews Facebook Page, please consider visiting one of the following to start/join in any discussion.

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

CandlePowerForums – Knife Reviews Section (Largest and Friendliest Flashlight Community Forum)

Knife Showcase: Lajolo Knife Urban 01 LP “La Prima” Limited run of 300

This Knife Showcase takes a close look at the Lajolo Knife Urban 01 LP “La Prima”, a limited edition of only 300 pieces, produced and distributed by Extrema Ratio.

The knife was designed by the master of arms Danilo Rossi Lajolo of Cossano, who created the World Calix Academy in 2007.

You can find the knife at the “The Factory” along with lots more.

SHOWCASE VIDEO:

SHOWCASE GALLERY:


 
Discussing the Showcase:
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First Look: Extrema Ratio Sethlans Knife

This is a first look at the just launched Extrema Ratio Sethlans knife. This knife is designed to be used for bushcraft, survival, and as a backup blade, so is also ideally suited for prepping. But you are going to want to use this, not just leave it sitting by ‘just in case’.

The ‘First Look’ Video:


What’s in the box?:


Explained by the Maker:
The reasons for certain design choices may not be clear when simply looking at an object, so this section is intended to give an insight into the thinking behind a design by speaking to the designer themselves.
Quoted directly from Extrema Ratio –
““EXTREMA RATIO SETHLANS” a fixed blade work knife born to face a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade.

SETHLANS was designed in collaboration with Daniele Dal Canto, Master Advanced F.I.S.S.S. instructor (Italian Federation of Sports and Experimental Survival).

SETHLANS is available in two different versions with two different kinds of steel.

The stone washed version is produced with böhler N690 heat treated at 58 HRC, chosen for the reliability it has demonstrated over the last 20 years due to its resistance to oxidation and durability of the edge.

The black version is produced in D2 steel, heat and cryogenically treated at 60 HRC, which presents an high resharpening capacity even with makeshift tools. In order to give greater qualities of hardness and resistance, the blade is coated with the new Teflon-based product “EXP DARK”, proposed by Extrema Ratio.

The knife comes with G10 grips that feature the ergonomic design characteristic of Extrema Ratio handles. They can be removed by releasing the skeletonized structure of the knife, that allows maximum lightness with minimum thickness. For lovers of extreme customization, the full-tang structure allows the handle to be covered with a paracord cord.

The sheath is composed of a part in very light and minimalist Kydex. It can be disassembled and can be adapted for both left and right handed users. The addition of an optional belt clip allows the knife to be positioned both vertically and horizontally and makes the sheath much more versatile than the textile version. It is also equipped with a mini pouch with M.O.L.L.E. system. containing a two-sided stone for sharpening and a Firesteel for lighting fires”.

Type: Fixed blade
Use: Survival
Blade Length: 107 mm (4.21”)
Overall Length: 224 mm (8.82”)
Blade Thickness: 6.3 mm (0,25”)
Main Grid: Flat
Weight: 207 g (7,30 oz)
Blade Material Sethlans Stone Washed: Böhler N690 (58HRC) steel
Blade Finishing Sethlans Stone Washed: Stone Washed
Blade Material Sethlans Black D2: D2 (60HRC) steel
Blade Finishing Sethlans Black D2: EXP DARK
Handle Material: G10

 
Discussing the Review:
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Knife Review: Extrema Ratio Fulcrum II D Desert Warfare

Extrema Ratio have built a reputation for making super strong knives; in this review of the Fulcrum II D ‘Heavy Folder’, we are taking that detailed ‘Tactical Reviews look’ at this re-launched folding knife. ‘Overbuilt’ is often used to describe knives with heavy construction, but is not how I would describe Extrema Ratio’s Fulcrum II. ‘Overbuilt’ suggests excessive design, but behind every Extrema Ratio design is a purpose and intent to give the owner confidence in a tool that won’t let them down. Initially I was sceptical – would the build of the Fulcrum II hamper its usefulness? But it has surprised me; read on to find out more.

A few more details:

What’s in the box?:


A good look round the Fulcrum II – Things to look out for here are:

As you look round the Fulcrum II you will see how the design has been kept simple yet functional and how solid every part is.


The Locking-Lock:

There are other knives that have a secondary lock to secure the main lock of an open folder, and there are assisted-openers that have a safety lock to prevent the blade springing open in your pocket, but I have yet to come across another folding knife with a secondary lock quite like the one on the Fulcrum II.
A back-lock mechanism uses the lock-bar’s spring to hold the blade in the folded position and then to keep the lock engaged when the blade is open. The lock-bar needs to move to allow the blade to open and close.
In the Fulcrum II, there is a secondary manual lock that locks the lock-bar itself, preventing from moving at all. This means if the blade is closed, it cannot be opened, and if opened the lock cannot be released to allow it to fold. This single secondary lock can secure the blade in either the opened or closed position.
As this is not something that would be obvious to everyone, one use-case for this is to prevent someone taking the folded knife off you and then using it against you (unless they know). The more likely use being to effectively make the folding knife a fixed blade knife ensuring that it cannot be accidentally closed.


Explained by the Maker:


The following text is from Extrema Ratio’s own product description.

This model is the evolution of the FULCRUM Folder (out of production since 2005), the first folding knife produced by Extrema Ratio according to the specifics of an Italian counter-terrorism unit. The FULCRUM II is basically identical to its predecessor, the only variations being the addition of a reversible clip and a partially lowered surface on the handle which improves the ergonomics and makes operating the opening pin easier. A manual security lock holds the BACK-LOCK mechanism lever, preventing accidental unlocking of the blade block during heavy-duty use. It can also be used to lock the knife closed in the event it’s taken away from the user: then the FULCRUM cannot be opened, even if the mechanism is often irrevocably damaged. The back of the flat-ground blade offers a comfortable resting point for the thumb. The tempered steel tang can be used as glass breaker and is provided with a hole to affix a security cord. Available versions: FULCRUM II D BLACK, FULCRUM II D DESERT WARFARE, FULCRUM II D BLACK RUVIDO, FULCRUM II T BLACK, FULCRUM II T DESERT WARFARE, FULCRUM II T BLACK RUVIDO.

The Blade and Handle – Detailed Measurements:

Now even more detailed!

Taking things far beyond most knife specifications, in this section I will be carrying out a detailed examination of geometry, balance, edge bevels, factory sharpness and structural edge testing using the industry leading measuring tools.

These measuring tools include a Vernier protractor, callipers, fixed radius gauges, the unique Arc Master adjustable radius gauge, Edge On Up’s BESS Certified PT50A and SET tester along with CATRA’s Hobbigoni LASER Edge Protractor.
The BESS ‘C’ scale of sharpness (Brubacher Edge Sharpness Scale) will be used to verify the sharpness of the factory edge and allow the knife to be brought to a minimum standard sharpness before testing a blade’s cutting performance.


The measurements have been tabulated and are presented along with a few reference blades. The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.

The first table in this gallery shows the standard review measurements, however, this is one of the first reviews on Tactical Reviews to feature a new measurement. Using the Edge On Up Structural Edge Tester (SET) to measure the resistance of a knife’s edge to rolling.

This is to be expanded upon in future articles, but for now, in the SET results the key factors are:
Series 1 Degradation – how much damage the edge suffers from one edge rolling cycle. The damage is represented by an increase in the BESS ‘C’ score. (Averages also shown for A and B)
Series 2 Degradation – how much damage the edge suffers from one further edge rolling cycle. (Averages also shown for A and B)
Degradation after strop – has the edge been permanently damaged/chipped or can it be recovered with stropping? A negative number means it actually improved from the starting figure, suggesting there may have already been some rolling of the edge before testing. (Averages also shown for A and B)


The blade is made from BöHLER N690 STEEL (58HRC).

What it is like to use?

Before I could really appreciate the Fulcrum II, the edge needed reworking. Embarking upon this revealed a few things you should be aware of.

The factory edge was very steep, a total inclusive angle of 64 degrees. Taking the BESS sharpness measurements with an average score of 409,and a small thick blade, you have a less than eager cutter. Should you wish to use it as an extraction tool and cut through metal sheeting and pry with it, this edge will quite likely serve you well, but I wanted to know if this knife would also serve for daily tasks.

With such a thick blade and a primary blade grind at 21 degrees my intention was to take the edge angle to 40 degrees inclusive. I’d generally take a pocket knife to 30 degrees inc, but this is not a normal pocket knife and the edge bevel would be getting a bit too wide.

So, check this first photo in the gallery and you will see that the thumb stud creates an angle of about 53 degrees in relation to the edge bevel, making sharpening to anything less than this difficult. The only option is to remove it. Thankfully Extrema Ratio have made the thumb-stud removable and provided the Allen key for it, so no problem there. However, remember that the blade-stop in the closed position IS the thumb-stud, so once you take it off, don’t go closing the blade or you will undo all your hard work.

The major edge bevel angle change was carried out with a small belt grinder. It was taken to a burr and stropped to remove the burr, but I could never quite get it as sharp as I wanted. This might be that the belt needs changing, but before confirming that, I just moved onto a DMT Aligner kit and got the edge shaving sharp. The new edge bevel is significantly wider than the factory edge bevel, especially at the tip (about 4mm wide), so it does change the look somewhat.


In all honesty, on first starting to use the Fulcrum II with the factory edge, I was underwhelmed and thinking I now had an overly heavy folder that was not much use to me; despite having a very satisfying presence. However, the 20dps (degrees per side) edge has totally transformed the Fulcrum II. I cannot recommend enough just putting this edge angle on it straight out of the box.

Changing the edge angle to an inclusive 40 degrees makes this a properly usable knife. You can now appreciate its substantial feel and operation along with its, now useful, cutting performance.

Despite this new edge bevel angle transforming it, the Fulcrum II does still have a very thick blade. It is never going to slice like a thin blade – but who cares?! That clunk of the lock as you open it, the handle size and ergonomics – you know you are holding heavy duty metal.

Ergonomics are good and functional even with the angular look. Thumb-stud opening is firm but not stiff. If anything is over stiff, it is the back-lock spring. Unlocking the blade is quite tough, and I need to change grip specifically to one where I can apply maximum force to the lock – I can’t see this ever releasing accidentally due to a firm grip.

I do find the secondary lock very satisfying. Perhaps oddly, I like locking it closed, keeping the blade safely folded and stopping curious people opening it. Then the secondary lock on the open knife making it close to a fixed blade. This extra level of certainty adding an extra dimension to the Fulcrum II. If I were to express a minor doubt, it is the amount of engagement of this secondary lock. The secondary locking button overlaps the handle slab (to create the block) and does so with less than 1mm of overlap. Enough to function, but not quite in fitting with the solidity of everything else.

Putting it to woodworking duty, the Fulcrum II was a pleasure to use. I didn’t want to stop carving. The new edge bevel, being quite wide, gives it a semi-scandi effect and it was just eating up stick after stick. I did remove the pocket clip as, for me, this significantly improved the ability to work with it for extended periods.

This knife demands attention. Attention simply due to its build and presence, and the attention you need to give it to get it set up right, as you will need to put that proper working edge on it to be able to appreciate it. I like big and heavy folders as long as they can be put to real work – exactly what I’ve been doing with the Fulcrum II.


Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________
Things I like
_______________________________________________

Proper ‘Heavy Folder’ with respected pedigree.
Secondary lock, completely locking the blade open or closed.
Excellent fit and finish.
Very satisfying action.
Large finger guard.
Ambidextrous pocket clip.
Not that heavy despite solid build.

_______________________________________________
What doesn’t work so well for me
_______________________________________________

Factory edge far too steep at 64 degrees.
Thumb-stud needs to be removed for sharpening.
Relatively shallow blade for its thickness.
For hard use it is much easier on the hands without the pocket clip.
The primary lock is a bit too stiff.
No pouch supplied.

 

Discussing the Review:

The ideal place to discuss this reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

CandlePowerForums – Knife Reviews Section (Largest and Friendliest Flashlight Community Forum)

The BESS Exchange – A forum discussing technical aspects of sharpness and truly understanding your sharpening process.

Knife Review: Extrema Ratio RAO II

Extrema Ratio’s RAO II is an update of the original RAO which was developed back in 2006. Designed as a super tough, compact, survival and field knife, the brutish RAO was an immediate modern classic. In 2014, with improved ergonomics and a new drop-point blade, the RAO II widens the appeal of the RAO to those that found the original tanto blade a bit too specialised. On a personal note, this is one of those knives I knew had to be in my life, and it has not disappointed.

The Blade and Handle Geometry:

Most knife specifications have a basic description of the blade geometry, but in this section I will be taking a more detailed look at geometry and balance.

Using a set of gauges and precision measuring equipment including a Vernier protractor, callipers, fixed radius gauges and the unique Arc Master adjustable radius gauge (the one that looks like a crossbow).

These measurements have been tabulated and are presented along with a few reference blades (8″ Chef’s Knife, 5.5″ Santoku and the popular Fällkniven F1).

Key aspects such as the primary bevel angle, grind type, blade depth, blade thickness, length, weight are detailed, along with balance information.

The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.

In the case of full convex grinds the approximate centre of the grind is used for the primary bevel angle estimate.

The blade is made from Böhler N690Co steel.

New for 2018! BESS Certified sharpness testing:

The BESS ‘C’ scale of sharpness, developed by Mike Brubacher (Brubacher Edge Sharpness Scale) will now become part of Tactical Reviews’ knife testing process. Initially this will be used to verify the sharpness of the factory edge and allow the knife to be brought to a minimum standard sharpness before testing a blade’s cutting performance.

The RAO II’s factory edge has an average BESS ‘C’ sharpness of 279. A score below 300 for a factory edge is good and it will slice 80gsm paper nicely and slices into the rounded edge of a doubled over sheet of the same 80gsm paper. Unfortunately a small nick in the original edge catches in some cuts causing some tearing. It is quite common for factory edges to have some flaws, and these can easily be sharpened out, so this is just an observation.

Explained by the Maker:

The reasons for certain design choices may not be clear when simply looking at an object, so this section is intended to give an insight into the thinking behind a design by speaking to the designer themselves.

Unfortunately I can’t always get time with the designer so will use this section to include relevant information about the knife and its designer.

From Extrema Ratio’s product information:
“In June 2006, the “185° Rgt. Ricognizione e Acquisizione Obiettivi” (Target Acquisition Regiment) airborne “FOLGORE” (185° RAO) entrusted to Extrema Ratio the development of a unique knife fitting the unit’s specific operational duties. This resulted in the RAO: not an oversized folder as much as a compact survival & field knife, with a heavy and dependable blade. Its very reliable locking system, assisted by an extra safety device, effectively turns this folder into a fixed blade knife. The opening and closing is to be performed with both hands in order to minimize the risk of self-inflicted injuries, as the blade, because of its weight, is a veritable guillotine. The extra safe device is a steel pin to be hand-screwed through two holes by the guard section of the massive Anticorodal aluminum handle – its presence between blade and hand also acting as a great psychological boon. The sheath is an essential part of this weapon system: it holds a diamond-plate sharpener and enables user to carry the knife either in open position, held in place by a cord and two clips, or closed, inside the front pocket. The sheath can be attached to tactical vests or common belts, being MOLLE system-compliant.

RAO II is the new version of the celebrated Extrema Ratio RAO knife; it comes with a new drop-point blade and an improved handle, rounded at the upper corners for a more ergonomic grip. The extra safety lock effectively turns it into a fixed blade knife enabling great chopping performance with no risk of injury. The sheath can hold the knife in open position for frequent use, or in closed position inside the front pocket. It comes with a diamond-plate sharpener to always keep a perfect edge. ”

A few more details:

Extrema Ratio’s knives are always well presented; the RAO II comes in a quality cardboard box.

Sliding the lid off, shows the RAO II (in a plastic bag) fills the box.

The RAO II arrives in its dual purpose sheath. We need to have a closer look at this sheath before we move onto that amazing knife.

On the back are the MOLLE fitting straps. As supplied they are not woven into the webbing but just held with the press studs.

As with most MOLLE mounts, the fit is pretty tight.

If just using the webbing next to the press studs, the MOLLE straps form a belt loop, which is how I’ll be using this for the most part during testing.

This dual purpose sheath has a large front pocket with plastic buckle fastener holding down the flap.

The flap has another strap attached to it with two press studs. This is the retaining strap for when the sheath is used to carry to opened RAO II.

Releasing the strap from the two press studs and now you can see where the blade of the opened knife is inserted.

Flipping open the flap covering the front pocket and you find the diamond sharpener slipped into a small pocket in front of the main compartment.

This sharpener is a steel plate with a diamond pad on it.

The diamond pad appears to be a special fabric adhesive tape with a diamond abrasive.

There are the three major components, the sheath, the knife, and the sharpener.

‘RAO II’ is engraved on the back-spacer.

There is no mistaking the presence of this knife. Even when folded it is a beast.

Out of the box, the RAO II is actually locked shut. We’ll look at the special locking/safety pin next.

So, one of the RAO II’s special features is its safety locking pin which effectively makes it into a fixed blade knife. This fits through the finger guard and can be fitted with the blade open or folded.

One end of the pin is threaded, so it screws into place.

The pin is on a loop of elastic, so once removed it cannot be dropped or lost (unless the elastic cord is cut).

With the safety pin out of the way, the blade can pass between the two parts of the finger guard.

A sliding bolt-lock is used, and this also acts as the back-spring that keeps the blade in the folded position.

Now the blade is opened, we can put the safety pin back in place to secure the blade in the open position. There is no getting past that pin.

Pivot tension is set using a single sided pivot bolt (the other side is a blank plate). The pivot bolt head has a notched edge which allows it to be securely locked in place using the small screw that fits into one of the twelve notches. With the pivot locking screw in place, the pivot bolt cannot turn at all. You can beat on this knife as hard as you like and that pivot bolt won’t come loose.

The improved ergonomics are obvious with well rounded edges all round the handle. Extrema Ratio’s handle style is recognisable with the first two fingers grip. The RAO II also includes a third and fourth finger grip.

There is jimping at the base of the handle for the thumb, when using a reverse grip.

The H is tight and precise, fit and finish is excellent all over.

And now onto that purposeful blade. A drop-point with bayonet grind, the RAO II’s blade is very deep. The area where the logo is printed is thinned slightly from the full thickness to provide a grip for opening the blade with.

A close look at the blade tip and edge bevel.

The plunge line is well rounded to maximise strength. The slight double-plunge effect here is caused by the primary bevel meeting the blade opening grip and its different radiusing.

With the blade halfway open, you can get a clear view of the locking notch in the tang. The bolt lock drops into this notch when the blade is fully open.

So we’ve taken the folded knife out of the sheath front pocket, opened it and fitted the safety lock pin. Instead of taking the pin out again to fold it, we can simply fit it into the sheath to carry it like a fixed blade. Note one of the press studs is uncovered as the retaining strap now only reaches the top press stud.

A view from the back with the opened knife sheathed.

The retaining strap sits over the deep finger guard, giving it a very secure hold.

What it is like to use?

If you ignore the pivot bolt and bolt lock button, the impression of this knife is not of a folder, but of a chunky fixed utility knife. In a bare hand (I take XL gloves) the finger grips are not quite in the right place. With gloves on they are a better match, but are definitely a better fit for large gloved hands.

It’s big, but somehow seems perfectly reasonable once you pick it up. However, that handle is a significant size and the blade very deep, just look at the next photo.

Putting the RAO II next to a full size fixed blade (using the Extrema Ratio TASK J in this case), its blade is not as long, but it is larger in every other way – and this is a folder!

Extrema Ratio have proven time and again that they put real effort into all the details, including the sheaths. Their sheaths are strong, great quality, and highly functional. For the RAO II, this is taken even further, as the dual function sheath is a carry pouch for the folded knife (plus sharpener) as well as a sheath for the RAO II as a fixed blade.
Due to the dual design, the RAO II does carry high on the belt if used as a fixed blade sheath. This is because there is no hanger for the belt loop which would normally drop the carry height (like it does on most fixed blade sheaths).

The included sharpener, I’d class as one of those emergency options which is great because you have it with you, but not for regular use. I’m glad it is included, but won’t be rushing to use it.

This is a short video taking a look over the RAO II and a technique to make the refitting of the safety lock pin easier.

Video Edited with – Cyberlink Director Suite 5 (PowerDirector 16 and AudioDirector 7)
Camera – Panasonic HC-V770    Microphone – Tonor TN120308BL

Now you’ve seen the video, and the safety lock pin coming in and out, you might come to the same conclusion I have. This is a great feature, and one I use, but there are many times I want to use the RAO II as a large folder and be able to open and close it quickly. In this case the pin is not being used, and if left attached, as it comes with the knife, it then flaps around and hits your hand, the knife and anything else in range. I got sick of this, so decided to alter things slightly and make it easy to remove the pin entirely.

This is my set-up. I’ve taken the original black elastic out of the lanyard hole and added my own loop using 2mm sailing cord.

The original elastic cord with the pin on it is then looped through the sailing cord in a larks head knot.

This larks head knot can easily be loosened and slipped off the sailing cord.

Two overhand knots keep the sailing cord set in the position I wanted.

With this easy modification, that excellent safety lock pin can be set aside for when you want to use the RAO II in more extreme ways, but for general use and really making the most of this knife as a folder, it becomes more of a hindrance. Without that hindrance the RAO II becomes fun to use and revels in its stature and super heavy build.

The bolt lock works so intuitively; as you grasp the knife to fold it, your fingers naturally pull on the bolt as you press the blade into the handle. Unlocking and folding in one motion, as shown in the video.

Talking of super heavy build, this folder is exceptional in the trust you can put in it. That simple idea of the safety lock pin, makes it a folder you can treat just like a fixed blade and not have any concern it might fold on you. Described by Extrema Ratio as a ‘compact’ survival knife, the knife in its sheath is not particularly compact; the dual functions of the carry pouch and fixed blade sheath bulk it up somewhat. The knife on its own however, for the size and strength of knife you get to use, is nicely compact thanks to being a folder.

I’m not going to suggest that this is the most practical knife for general use, but it will make you grin when you bring it out – every time.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
Safety lock pin fixes the blade open with complete reliability. If not fitted the safety lock pin flaps around on the elastic cord.
Superb dual function sheath (pouch/fixed blade). Supplied sharpener gets in the way.
MOLLE compatible sheath. Combined pouch / sheath is a little bulky.
Super strong build. Sheath is right-handed only when the blade is open.
Distinctive Extrema Ratio style.
RAO II blade shape more useful to most users.
Basically just awesome.

 

Discussing the Review:

The ideal place to discuss this reviews is on a forum. If you started reading the shorter forum version of the review, but followed the link this full exclusive review, please return to that forum to discuss the review there.
If you read the review entirely on Tactical Reviews, please consider one of the following to join in any discussion.

BladeForums – Knife Reviews (US based Forum for Knife Discussion)

CandlePowerForums – Knife Reviews Section (Largest and Friendliest Flashlight Community Forum)

The BESS Exchange – A forum discussing technical aspects of sharpness and truly understanding your sharpening process.

Knife Review: Extrema Ratio TASK J

Based on the original TASK tactical knife designed by Thilo Schiller, this version of the TASK, the TASK J has been developed as a collaboration with the Jagdkommando Unit, the Austrian Army special forces. Their requirements were for a heavier duty version of the original TASK which could survive more extreme use.

The Blade and Handle Geometry:

Most knife specifications have a basic description of the blade geometry, but in this section I will be taking a more detailed look at geometry and balance.

Using a set of gauges and precision measuring equipment including a Vernier protractor, callipers, fixed radius gauges and the unique Arc Master adjustable radius gauge (the one that looks like a crossbow).

These measurements have been tabulated and are presented along with a few reference blades (8″ Chef’s Knife, 5.5″ Santoku and the popular Fällkniven F1).

Key aspects such as the primary bevel angle, grind type, blade depth, blade thickness, length, weight are detailed, along with balance information.

The ‘Balance relative to the front of the handle’ tells you if the knife will feel front heavy, or if the weight is in your hand (a positive value means the weight is forward of the front of the handle). The ‘Balance relative to the centre of the handle’ indicates how close to a ‘neutral balance’ the knife has in the hand.

In the case of full convex grinds the approximate centre of the grind is used for the primary bevel angle estimate.

The blade is made from ACCIAIO BöHLER N690 (58HRC) steel.

New for 2018! BESS Certified sharpness testing:

The BESS ‘C’ scale of sharpness, developed by Mike Brubacher (Brubacher Edge Sharpness Scale) will now become part of Tactical Reviews’ knife testing process. Initially this will be used to verify the sharpness of the factory edge and allow the knife to be brought to a minimum standard sharpness before testing a blade’s cutting performance.

The TASK J’s factory edge has an average BESS ‘C’ sharpness of 533. Though this officially comes in as a ‘dull’ edge, it will just slice 80gsm paper. Because there are some areas at a BESS ‘C’ score of 407, that allows for a borderline working edge, which is the only reason it is possible to slice 80gsm paper with this factory edge.

Explained by the Maker:

The reasons for certain design choices may not be clear when simply looking at an object, so this section is intended to give an insight into the thinking behind a design by speaking to the designer themselves.

Unfortunately I can’t always get time with the designer so will use this section to include relevant information about the knife and its designer.

Direct quote from Extrema Ratio’s website.
“This tactical knife has been developed together with material experts of Jagdkommando Unit, the Austrian Army special force. It is a multi purpose tactical knife with double guards to avoid accidentally slipping of the hand on the blade. It comes with standard desert side sheath with automatic retention mechanism and protective slap. A fireball flint and striker is placed inside the sheath.”

A few more details:

A well made cardboard box is used for the TASK J.

The full package is wrapped in a plastic bag, and fills the substantial box.

Along with the bagged knife are two leaflets and a quality control card.

Slipping the TASK J out of the bag; the leg strap is kept neatly in place with a rubber band.

Taking a moment here to mention that Extrema Ratio have packed the design of the sheath with so much detail, this needs to be appreciated, so we’ll be covering this before moving onto the knife.

Being a full size knife, there is a removable leg strap to allow you to really keep it under control in vigorous situations.

The leg strap has a double elasticated section so you can fit is snugly without then finding it cuts in uncomfortably.

Both ends of the leg strap are adjustable in length using velcro. There is an elastic cover to slide over the end of the strap end to prevent it from being pulled away during use.

In exactly the same way you adjust the length (by pulling apart the velcro adjustment), you can also remove the strap fully.

For now the leg strap is off and set aside until needed.

Onto the main sheath. The most obvious atypical feature is the full knife handle cover; as shown here, the knife itself is almost fully concealed. This flap is a critical feature to help prevent a knife fitted to a pack becoming a ‘hang up’ hazard. With the flap over the knife handle it is far less likely to catch on something.

Not relying on a fabric to keep the blade from cutting through the sheath, there is a full plastic sheath liner. This is the bottom of the sheath with the special fixing (visible on the front of the sheath) and the black plastic liner plug that closes off the end of the liner, but leaves gaps for drainage.

A high quality plastic snap buckle holds the knife cover flap in place.

Rolling the sheath over and there is a full length MOLLE fixing strap.

The top of that MOLLE strap is what holds the removable knife cover flap in place.

Here the knife cover flap has been folded under the rest of the sheath. Note the thin black cord running down the side of the sheath.

That cord runs all the way down and is held by the MOLLE strap press stud.

Freeing the black cord, and now starting to draw the MOLLE strap out of the loops.

With the MOLLE strap fully released the cover flap can be removed.

Following the thin black cord to the top of the sheath liner.

Give it a tug and a thick fire-steel starts to slide out.

And it just keeps coming… the fire-steel is the full length of the sheath!

The knife retention strap is also adjustable / removable, with velcro holding it in place.

The primary knife retention is not the strap, but is a plastic tab that is part of the sheath liner.

You can see how the side of the handle hits that plastic tab as you insert the knife into the sheath.

Push a little more firmly, and the knife clicks into place. It is now held in the sheath by this plastic tab, requiring a firm pull to free it.

Having covered its feature packed sheath system, here is the TASK J.

Though similar to the TASK in that it has a double-edged, modified wharncliffe blade, the primary bevel is quite different, as well as the blade having a bayonet grind.

The blade is symmetrically ground.

Extrema Ratio’s distinctive Forprene handle is used, in this case the desert colour.

Used on several models, this recognisable handle is particularly effective. The grip design provides a secure dual finger groove and the Forprene material cushions the user from the shock of heavy blows.

Another clear design feature intended for extreme use, is the double guard which provides the greatest protection against the hand slipping forward onto the blade.

A well radiused plunge line keeps maximum strength at the transition from cutting edge to ricasso. Note the lack of a choil which in this case removes the chance of a hang-up if the blade has made a full depth cut.

There is a single bolt to keep the handle in place.

Though an upper guard does get in the way of thumb forward grip, the guard is angled forwards slightly, so you can still take this type of grip with the thumb pushing onto the guard. Note the lanyard /lashing hole in the guard.

A good sized lanyard hole makes it easy to fit a cord if you want, and the tang protrudes from the end of the handle providing a hammering surface.

As mentioned before, the TASK J has a bayonet grind and a military style double edged tip.

Taking a very close look at the tip.

To properly show the proportions of the TASK J, this side shot minimises perspective distortions.

What it is like to use?

Extrema Ratio’s TASK J is not what I would normally think of as your ‘every day’ knife. It is a specifically heavy duty knife, for conditions where you need that absolute assurance the blade is as strong as it could be and will take anything you throw at it.

The superb attention to detail in the sheath design only reinforces how the whole package is intended to work in conditions most of us will thankfully never have to endure. With comprehensive carry options you can pack this knife in all sorts of ways and know it will still be there with you through the worst.

What the TASK J does that is different to most of the other knives capable of demolition/extraction work, is to maintain the more refined feel of a general purpose knife instead of just seeming like a large slab of steel – an important distinction.

Taking the TASK J in hand, and it is a full size knife, having a blade just over 6″ long. The ultra modern looking grip is very comfortable and secure to hold (one reason it features on many of Extrema Ratio’s knives). Despite the amount of meat in the blade it does not feel overly heavy or unbalanced.

In a reverse grip, the top guard does interfere somewhat with the range of movement, and makes it more difficult to bring the blade back close to your arm.

For a thrusting grip, the thumb can sit onto the upper guard thanks to an angled rear surface and this does give the user good power and control.

Going back for a minute to the sheath, the click-retention makes for a very effective system, the knife can come in and out of the sheath repeatedly, yet despite not using the retention strap, it is held securely and won’t fall out. Details like this are not to be underestimated, as working with a knife it is far better to re-sheath it than leave it lying about between cuts, and if you have to move off in a hurry, it stays where it should be and with you. There is nothing flimsy about any aspect of the sheath. Wherever you put it is where it will stay, and it is also fully ambidextrous.

For such a heavy duty blade, the balance is extremely good. It is in front of the first finger, as the balance point sits at the guard itself. This makes it slightly blade heavy, but much less than similar knives, and certainly not fatiguing when using it for finer duties when you want a lighter feel.

Personally I have little need for the double edged tip, and of course this makes penetrating cuts that much more effective.

Extrema Ratio don’t do things by halves, and in this case I’m referring to the blade coating. It is black, properly matt black, without any reflection; only the cutting edge might glint. One consequence of this blade coating is that it does add drag to the blade, which at times can be quite noticeable. When wiping off the blade I particularly find that the blade tends to grip the material and pull it along. I suspect with more use and wearing-in, this coating will smooth out a bit. So for those who don’t need that ultimate stealth anti-reflective effect, this coating can affect the ‘speed’ of this blade. If you like black blades, this is really Black, so you won’t be disappointed.

With there being such a large fire-steel included I was surprised that there wasn’t a striker on the blade spine. Extrema Ratio said that with the fire-steel only likely to be used in very rare instances, if needed, the blade edge would be used. Definitely not something I’d want to do, so I’ll be grinding a small striker into the spine.

Putting the TASK J next to the Extrema Ratio knife that first drew me to the brand, the Fulcrum. The TASK J’s blade is a little wider and shorter than the Fulcrum. With the Fulcrum’s double guard next to the TASK J’s, also note how the TASK J has lanyard / lashing holes in its guard – more flexibility in the way you can use it. It might have been made for the special forces, but this is firmly in the territory of a tough survival /utility knife.

With the TASK being such a good general utility blade, it is no surprise that a special forces unit (the Jagdkommando Unit) were enthusiastic for a heavier version of that blade style, and they certainly got it in the TASK J.

Review Summary

The views expressed in this summary table are from the point of view of the reviewer’s personal use. I am not a member of the armed forces and cannot comment on its use beyond a cutting tool or field/hunting knife.

Something that might be a ‘pro’ for one user can be a ‘con’ for another, so the comments are categorised based on my requirements. You should consider all points and if they could be beneficial to you.

_______________________________________________ _______________________________________________
Things I like What doesn’t work so well for me
_______________________________________________ _______________________________________________
Strong, but well balanced, blade. Blade coating can ‘drag’ when cutting.
Super versatile and effective sheath. Poor factory edge.
Giant fire-steel included. No striker for the fire-steel.
Effective and comfortable grip.
Double guard with lashing points.

 

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