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.
The Extrema Ratio LKU01 URBAN DARK embodies Italian craftsmanship, designed for those who demand reliable performance with a sophisticated design and unmatched tactical profile
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
Proudly Italian, the Extrema Ratio LKU01 URBAN SIDERAL stands as a masterpiece blending refined design and tradition with exceptional performance. Developed in collaboration with Master at Arms Danilo Rossi Lajolo di Cossano, this knife perfectly balances elegance and tactical functionality
The Versa Expeditions by Extrema Ratio is the perfect embodiment of versatility, designed to meet the needs of outdoor enthusiasts such as survival, bushcraft, hunting, as well as for extreme tactical scenarios. Its robust build and technical features make it an indispensable companion, combining efficiency and reliability in any context.
“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 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 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.
Ant è il coltello chiudibile più compatto di Extrema Ratio. Nonostante le sue dimensioni ridotte, questo modello vanta una struttura estremamente robusta, resistente ed affidabile.
The Extrema Ratio Misericordia has been embraced by the 4th Regiment of Alpine Paratroopers, who actively participated in its development and testing. This fixed-blade tactical knife boasts remarkable lightweight and compactness, serving adeptly as both a primary and backup blade.
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
The FULCRUM is a milestone among multi-role knives. Widely employed in Afghanistan as standard equipment by the members of the Italian 'Nibbio' mission, it is part of an experimental project for the renewal of individual equipment undertaken by the Alpine Troop Command.
Ant is the most compact folding knife by Extrema Ratio. Despite its small size, this model features an extremely robust, durable, and reliable structure.
The N.K.3 K STONE WASHED by Extrema Ratio is a compact knife designed for concealed carry as a backup tool, ideal for tactical operations. The Karambit ring allows for a secure grip
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 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.
Embark on a journey of excellence in the realm of italian in style Japanese knives with Kiridashi,
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.
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
EXTREMA RATIO BF2 R CLASSIC TANTO black
BF2 R are “Full size” folding knives especially suitable for professional use by military or police operatives.
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.
Satre is a pocket-sized, light and extremely resistant fixed blade knife. Given its characteristics, it can be employed in a large variety of activities and fields, including survival and bushcraft, or it can be part of an EDC kit (Every Day Carry).
It was designed in collaboration with Daniele Dal Canto, a Master Advanced Instructor. It can be worn as a neck knife thanks to its Paracord 550 lanyard.
Satre is a pocket-sized, light and extremely resistant fixed blade knife. Given its characteristics, it can be employed in a large variety of activities and fields, including survival and bushcraft, or it can be part of an EDC kit (Every Day Carry).
It was designed in collaboration with Daniele Dal Canto, a Master Advanced Instructor. It can be worn as a neck knife thanks to its Paracord 550 lanyard.
K-Talon is a fixed-blade karambit with a full-tang structure. It has a particularly thin shape with a thickness of only 10 mm including sheath and scales. The curved and hooked blade was inspired by the shape of a talon. It is designed to make clear and deep cuts as well as to hook, seize and/or tear.
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 Sethlans Expeditions, part of Extrema Ratio's new Expedition Series, is a fixed blade knife designed to handle complex situations and serve as a backup blade. This series is dedicated to exploration professionals, ensuring the same high-level performance, reliability, and quality that Extrema Ratio provides to military and law enforcement special forces.
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.
Kreios Expeditions, as well as the Kreios model from which it derives, was designed and developed thanks to the collaboration with the Master Advanced instructor Daniele Dal Canto. It is defined by its creator as a sort of "off road" of cutting tools, therefore not a specific disposable tool, but a multi-tasking tool, extremely versatile and designed to cope with numerous uses.
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.
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.
Extrema ratio DEFENDER 2 black
The combat version of Scout knife with ultra slim shape.