Extrema Ratio specializes in the development and production of professional knives for military, public safety and rescue use. We manufacture high quality military, tactical and hunting knives as well as a wide range of solid knives suitable for the harshest environments, making them a great choice for a survival knife or backup tool. The range ranges from small sized folding knives to large Kukri's, offering exactly what one would expect from a high end professional tool.
Extrema Ratio specializes in the development and production of professional knives for military, public safety and rescue use. We manufacture high quality military, tactical and hunting knives as well as a wide range of solid knives suitable for the harshest environments, making them a great choice for a survival knife or backup tool. The range ranges from small sized folding knives to large Kukri's, offering exactly what one would expect from a high end professional tool.
The production of our cutlery is characterized by industrial processes and handcrafted finishes, a feature that gives the company a strong identity: only the processes that guarantee uniformity, high production capacity and economy of scale are automated and industrialised. The processes remain artisanal, such as the controls, which guarantee the reliability and general high quality of the single pieces within the series, as well as all the operations which, by their intrinsic nature, derive their functional characteristics from the manual skill of the operator. An example of this is the sharpening, which is carried out exclusively in the traditional way for each type of knife.
Thanks to the interaction with the Armed Forces, first Italian then also international, the company has accumulated and is continuing to accumulate a valuable wealth of experience and information that allow it to proceed with the development of highly qualified and professional blades. We produce to specifications or develop new products to solve the problems that the customer indicates to us. Furthermore, the production potential is sufficient to guarantee large-scale government supplies, with very high quality standards.
The company internally carries out tests of efficiency and resistance of the products thanks to the development of specific tools. It collaborates with:
The Faculty of Motor Sciences of the University of Perugia which took care of the ergonomic aspect of our products: their indispensable ability to interface with the user.
The Faculty of Engineering of the University of Florence which takes care of the tests and analyzes on the structures, materials and surface finishes of the products.
The company is ISO 9001 certified and is registered among the suppliers of the Armed Forces, NATO Code (N/CAGE): AT200.
Extrema Ratio is the official supplier of the Italian and French Armed Forces, as well as supplier of the best Italian and international military and public security units.
The company's philosophy is to produce technical equipment of excellent functional value, long operational life and constant quality. The high level of quality is given by the functionality of the projects, by the choice of the best materials and the most modern treatments applied to our knives.
There are singular lines that characterize and distinguish our production. Over time, these factors have become witnesses of our philosophy, based on the quality and uniqueness of each individual piece.
Our products are professional technical tools, designed and manufactured to solve problems. We produce few items because we believe in their peculiarity: each of these is designed for a specific use.
Extrema Ratio knives are developed with the direct involvement of the end user. The interaction with our customers and the exceptional contribution of experience and knowledge has allowed the quality to grow every day.
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
“EXTREMA RATIO SETHLANS” is a fixed blade work knife born to face a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade.
The N.K.1 Black is a compact knife that takes inspiration from the lines of the SKINNER (included with the CULTER VENATORIUS hunting model) and has been transformed into a true tactical knife. The handle is ergonomically designed to prevent accidental cuts during extraction from the sheath. On the back of the blade, there's a space for thumb or index finger placement, depending on your needs. This knife is incredibly versatile, suitable for both powerful cutting and precision work.
EXTREMA RATIO SETHLANS” is a fixed blade work knife born to face a wide range of situations, suitable for survival, bushcraft, prepping, but also as a backup blade.
Extrema Ratio's Kiri is the perfect blend of Japanese tradition and tactical innovation.
The Extrema Ratio S-THIL STONE WASHED is a tactical backup knife with a monolithic structure crafted from a single piece of 5 mm thick BOHLER N690 steel. It was developed in collaboration with designer Thilo Arnd Schiller.
BF2 CT STONE WASHED - Folding Knife for Everyday Carry (EDC)
The BF2 CT Stone Washed is a full-size folding knife that is particularly suitable for professional use by military and police operators in the field. The handle provides a solid and comfortable grip, while the reversible and wrap-around clip serves as a useful thumb support in reverse grip.
The Extrema Ratio Contact C knife is the compact and versatile version of the renowned CONTACT model, now available with an elegant Wolf Grey handle and a Stone Washed blade. This knife is designed to excel in a wide range of operational situations, thanks to its reliable performance and rugged construction.
This series of "full size" closables are suitable for professional use by military and police operators employed in the field
Embark on a journey of excellence in the realm of italian in style Japanese knives with Kiridashi,
The BF1 is a folding knife for everyday use, simple, essential and functional. The blade, exclusively burnished, has a flat grind and the tip is particularly thick and resistant.
Introducing the Ferrum T, a folding knife with clear tactical characteristics, featuring a spear point blade with a lightening hole. With its sleek and compact design, the two handles made from anticorodal anodized aluminum create a lightweight, streamlined, and highly durable grip. This knife can be easily stowed in a pocket, snugly fit into small torch pouches, or securely attached to a M.O.L.L.E. system loop.
Introducing the Ferrum T, a folding knife designed with distinct tactical features, boasting a spear point blade with a lightening hole. With its slim and compact form, the two handles, crafted from anticorodal anodized aluminum, create a grip that is lightweight, sleek, and simultaneously highly resilient. This knife can be easily slipped into a pocket, snugly fit into compact torch pouches, or securely fastened within a M.O.L.L.E. system loop.
Extrema ratio DEFENDER DG black
The combat version of Scout knife with ultra slim shape.
BF2 CD STONE WASHED - Folding Knife for Everyday Carry (EDC)
The BF2 CD Stone Washed is a full-size folding knife that is particularly suitable for professional use by military and law enforcement personnel in the field.
Tactical Knife with light weight, very easy-to-hold. It comes with kydex sheath with innovative quick release system.
The SELVANS was developed as a cooperation between Extrema Ratio and the Master Instructor Daniele Dal Canto of F.I.S.S.S. (the Italian Survival Federation). It’s a modification of the ONTOS – a military survival knife – designed to enhance its effectiveness as a civilian tool. A longer handle and a heavier blade enable enhanced chopping and cutting action.
Extrema ratio DEFENDER black
The combat version of Scout knife with ultra slim shape.
The BDØ R WOLF GREY is a folding EDC (Everyday Carry) and collectible knife that excels in various situations. Its compact size and versatile design make it a reliable companion for your everyday adventures.
Extrema ratio MAMBA
Tactical Knife with light weight, very easy-to-hold.
It comes with kydex sheath with innovative quick release system.
Il BDØ R HCS è un coltello da collezione EDC (Everyday Carry) e chiudibile ideale per affrontare molteplici situazioni. La sua compattezza e design versatile lo rendono un compagno affidabile per le tue avventure quotidiane.
The BDØ R RANGER GREEN is a folding EDC (Everyday Carry) and collectible knife that excels in various situations. Its compact size and versatile design make it a reliable companion for your everyday adventures.
Extrema ratio DEFENDER 2 black
The combat version of Scout knife with ultra slim shape.
BD0 R Extrema Ratio
The two-inch nail. Available versions: Black, Desert, Hcs, Ranger Green and Wolf Grey
The BDØ R BLACK is a folding EDC (Everyday Carry) and collectible knife that excels in various situations. Its compact size and versatile design make it a reliable companion for your everyday adventures.
Extrema Ratio BF0 R CD DESERT
It is a small Basic folders. Its handle produced in technopolymer makes it light and resistant, also thanks to its steel internal frame.
Extrema ratio DEFENDER DG stone washed
The combat version of Scout knife with ultra slim shape.
The Extrema Ratio "REQUIEM" knife in the "HCS" coloration is a tactical fixed-blade knife equipped with an innovative sheath that can be attached to a single strip of the M.O.L.L.E. system. This level 2 retention system makes the knife slim, lightweight, and extremely effective. The "REQUIEM" knife is designed to tackle the most challenging tasks and offers reliable performance in any situation.
The REQUIEM WOLF GREY is a tactical combat knife with a fixed blade, designed for use in combat situations. It features an innovative sheath that can be attached to a single strip of the M.O.L.L.E. system, providing a level 2 retention system. This knife stands out for its slim and lightweight structure, making it highly effective.
Extrema ratio PANTHERA SATIN
Panthera is a new folding knife, the model maintains all the characteristics of the T-Razor, from which it draws inspiration, with the difference that the dorsal part of the blade goes down towards the tip like the wharncliff blades
The Extrema Ratio "REQUIEM" knife with a handle in the "Ranger Green" coloration is a tactical fixed-blade knife equipped with an innovative sheath that can be attached to a single strip of the M.O.L.L.E. system. This level 2 retention system makes the knife slim, lightweight, and extremely effective. The "REQUIEM" knife is designed to tackle the most challenging tasks and offers reliable performance in any situation.
This knife has been designed and perfected in every detail for its primary use in naval environments. The blade features a flat grind that allows for symmetric cuts with a broader support. The thick and durable tanto version of the tip provides greater penetration and a sharper, more precise cut. The stone-washed finishing process facilitates localization in marine environments.
Extrema ratio CONTACT Black
Extrema Ratio developed the first knife of a new production line, called CONTACT.
It has a blade with a lance-shaped profile, a flat grinding and a diamond-shaped geometry. It has got a lower guard branch to protect the hand from accidental cuts, upper jumping to improve grip, a concave fuller along the entire length of the blade and a generous thickness blade (6.30mm) All these details make the Contact the elder brother of the now famous Requiem, revisited in proportions and in some technical features. The first of a new line of multipurpose knives.