BF Folders
The BF series are folding knives for everyday use: simple, essential and functional.
Col Moschin Fixed Blades
Made to order for the renowned 9th Parachute Assault Regiment "Col Moschin" of the Italian Special Forces, which officially adopted it in 2002, this is a quintessential combat knife.
Corvo Fixed Blades
The Corvo is a traditional Chilean Army combat knife. The curved blade is a forced to be reckoned with.
Dobermann IV Fixed Blade
Over the years, the Dobermann has undergone significant change in look and design to meet evolving consumer expectations and ever-changing trends, while at its core retaining consistency with the original 1997 design.
Fulcrum Fixed Blades
A robust and sturdy family of fixed knives with comfortable handles and devastating tanto blades.
Kreios Fixed Blades
Extrema Ratio designed and developed the Kreios with Master instructor Daniele Dal Canto of the Italian Survival Federation, who dubbed it the "off road" of edged tools.
Kukri Fixed Blades
There's a reason the Kukri is a classic. It's ultimately a machete with a top-heavy, forward-positioned cutting edge, which enables it to function as an axe while retaining the versatility of a long blade.
MF Folders
The MF series is made up of very functional tactical folders of all shapes and sizes.
MPC Folders
One of the most robust folding knives on the market, the MPC incorporates all the characteristics of the FULCRUM II, but its heavier blade enables more effective cutting blows, useful for field work.
Nemesis Folders
The structure of the Nemesis is similar to that of the MPC. It is however much more suitable for defensive use with a strong lockback mechanism.
NK Neck Knives
The NK is a reduced-size neck knife is based on the Skinner and perfected to a true tactical backup knife.
RAO Heavy Duty Folders
The RAO is not an over-sized folder as much as it is a compact survival & field knife, with a heavy and dependable blade.
Resolza Folders
The Resolza is produced with the usual Extrema Ratio high-end materials and technologies.
Selvan Fixed Blades
The Selvan was developed as a cooperation between Extrema Ratio and the Italian Survival Federation. It is one of the best camping/survival knives available and even comes with a basic kit already put together for you.
SERE 1 Push Dagger
The SERE 1 measures in at 8.50" overall with a 4.75" black finish Bohler N690 stainless steel partially serrated single edge blade with a false top edge.
SERE 2 GOI Push Dagger
The SERE 2 measures in at 8.54" overall with a 5.83" black finish Bohler N690 stainless steel partially serrated single edge blade with a false top edge.
Shrapnel Fixed Blades
The Shrapnel is a truly versatile "back up" knife with a very compact handle and devastating blade shape.
TK Tool 2.0 Multi-Tools
A multifunctional tool with a basic and essential design, jointly developed with military professionals. It features a special tip useful for adjusting and calibrating firearm optics.
Ultramarine Dive Knife
The Ultramarine is an amphibious knife, carried by divers for underwater operations, though it would also make a great above-ground tactical fixed blade.
"Our knives are built with the most current high tech manufacturing processes. Each Extrema Ratio knife is a blend of the finest materials available and a commitment to craftsmanship. When it comes to knives for survival use, one of the most important requirements is that the knife should be strong. Built to last.
Unfortunately, the manufacturing excellence and quality of our knives leads people to believe they are virtually indestructible. Sadly, this is not the case.
When the correct bending moment (torque) is reached also the toughest knife breaks.
Factors which determine the strength of a knife are its blade length, blade
thickness and geometry, steel quality and technical design. Depending on what you want from a knife you should consider these qualities before you make your purchase, only then will you be able to make the optimal choice.
A long blade gives you more power, a thick, sturdy blade is stiffer, a well-treated high-end steel stands strain better and a well-designed knife is free from natural breaking zones. We leave no stone unturned in the search for Excellency.
In each knife we produce we do look for total performance solutions along with that style that defines all of our products entirely made in Italy.
What sets our knives in their own category of excellence is that every blade is free-hand ground, every knife is individually fitted, and every knife sharpened by hand. 
Precision and attention to small details, the use of special steel alloys, new techniques and knowledge and space technology materials make the difference.
With the objective of designing unique knives catered for the Armed Forces and Law Enforcement community and enthusiasts as well, Extrema Ratio has grown into a globally renowned brand recognized for dedication towards creating the next great combat knife. Our knives always put consumers and end users first.
All our products are built with high quality material and engineered in the best conditions and can be disassembled for easy cleaning and maintenance. This allows the worn parts to be easily replaced as well.
As a private company, Extrema Ratio continues to expand into new horizons and push the limit further with each product unveiling.
If you plan to change your Extrema Ratio knife it will not be because you are disappointed because our product has not performed as promised but because you have probably changed your hobby.
Here at Extrema Ratio anything is possible, the impossible just takes longer."
There is a common line which characterizes and distinguishes our production. 
These aspects are the symbol of our philosophy. 
All our products are studied and realized for the solution of problems, and are both technical and professional tools. 
We produce only a few articles, and we firmly believe in their efficiency.
Each article is dedicated to specific users.
For this reason we prefer to modify our products rather than making something different or new. 
The interaction we have with our clients has made an outstanding contribution to our experience and knowledge, thus transforming and advancing the evolution of our products.