Knife Review: Extrema Ratio FRAME ROCK XXV Anniversarium

Extrema Ratio have been celebrating their 25th Anniversary in style with a number of limited runs of new and old models.

In this review we are looking at the XXV Anniversarium Limited Edition of the overbuilt folder, the FRAME ROCK. If you do miss out on the limited edition, most of the content here is perfectly valid for the standard FRAME ROCK, so limited or standard, you can get one of these ROCK solid folders.

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

Review Videos

Starting with a short format sixty second review:

Onto a full video review covering many more details:

What’s in the box?:
Included with the Anniversarium Limited Edition, is a special numbered presentation case and Anniversarium challenge coin. In this section, instead of unboxing we are looking at that special presentation case.

The Anniversary Coin:
Before we move on, here are both sides of the Anniversarium challenge coin.

A REALLY good look round the FRAME ROCK – Things to look out for here are:
Unprecedented in size, this gallery contains more photos of details than ever before, to take in as much of this special edition as possible.
Folded or not, the FRAME ROCK is unmistakably Extrema Ratio with its grip pattern. The FRAME ROCK has presence even though it is relatively compact. On the plain head of the pivot bolt there is an engraving of the anniversary logo with a further XXV Anniversarium engraving just above this. Immediately you can see the 6mm thick blade stock with heavy jimping. An integral lock, the FRAME ROCK has a steel insert on the end of the lock bar to increase lock life and it can be replaced if needed.
Extrema Ratio folders use a pivot bolt with locking screw that prevents loosening. Unusually, the deep carry clip wraps completely over the end of the handle, fixed onto the opposite side’s handle. As it wraps over it has a slot to allow the glass breaker to protrude through the clip (this can be fitted on the opposite side).
Waisted spacers hold the handles in place, and give the FRAME ROCK its open back layout.
As the glass breaker is fixed in the solid handle (not the lock bar side), to accommodate this, should you swap the clip side, there is an extra slot in the clip.
Looking right into the pivot, what is visible are the ball bearing cups for the pivot bearings that give the blade a smooth action.

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 compact, heavyweight, overbuilt knife, it almost seems a contradiction, but the compact size actually allows for a relatively light weight for such a robust knife.
Featuring a beautiful spearpoint blade with fuller, using the same blade shape as the Contact and Contact C fixed blade models. The blade shape adds to the unique look the FRAME ROCK brings.
The more you handle it, the more you understand the allure of the unusual robustness for a knife of this size. Typically, overbuilt folders are much larger, but the FRAME ROCK fits within the hand, while having an incredible solidity – hugely satisfying.
Somehow it also belies belief that such a wide spearpoint could fit into the handle, looking all the more impressive as you swing it open.

For larger hands, the compact handle does mean the clip tends to dig in if you are working the FRAME ROCK hard, and in the left hand, the glass breaker can dig into your hand when taking a tight grip. But trade this off against the overbuilt strength you are carrying, a blade that will take on heavy tasks and not break a sweat.

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

Glass breaker digs into hand when used left-handed.
Thick blade reduces slicing ability.

Things I like

Incredible robustness for its size.
Stunning spearpoint blade with fuller.
Deep-carry ambidextrous clip.
Replaceable steel lock bar insert.
Pivot-bolt locking-screw to prevent loosening.
Smooth ball-bearing blade pivot.
Thick Titanium frame.
Special numbered presentation case.
Anniversarium challenge coin.

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