Extrema Ratio is specialized in the development and production of professional knives for military, public security and rescue use. Extrema Ratio produces high-level military, tactical and hunting knives as well as a great range of solid knives, suitable for the toughest environments, making them a great choice for a survival knife or a backup tool. The range goes from small folders to large Kukris, offering exactly what you expect from a high-end professional tool.

The production of Extrema Ratio's cutlery is characterized by industrial processes and traditional craftsmanship, a characteristic which gives a strong identity to the company; the only automated and industrialized processes are used to guarantee uniformity and high production capacity. The processes, such as quality controls, which guarantee the reliability and overall high quality of the individual pieces within the series are kept artisanal. The same goes for all those operations which, due to their intrinsic nature, derive their functional characteristics from the operator’s manual skills. An example is the sharpening, which is exclusively handmade on each type of knife.

Thanks to the interaction with the Armed Forces, first Italian then also international, the company has accumulated and keeps accumulating a valuable wealth of experience and information which allows it to proceed with the development of highly qualified and professional blades. Extrema Ratio tailors to specifications or develops new products to solve the problems pointed out by its customers. The production potential, furthermore, is enough to guarantee government supplies on a large scale and with very high-quality standards.

The company carries out internal tests of efficiency and resistance of the products thanks to the development of specific tools. Extrema Ratio collaborates with:
The Faculty of Motor Sciences - University of Perugia, which has taken care of the ergonomic aspect of the products.
The Faculty of Engineering of the University of Florence, which takes care of tests and analyses on structures, materials and surface finishes of the products.

The company is ISO 9001 certified and is registered as supplier for the NATO and different Armed Forces, (N/CAGE): AT200. Extrema Ratio officially supplies military, tactical and survival knives to the Italian and French Armed Forces, as well as to 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 quality consistency. The high level of quality is given by the functionality of the projects, the choice of the best materials and the most modern treatments applied to Extrema Ratio knives.
"There are unique lines that characterize and distinguish our production. These factors, over time, have become witnesses of our philosophy, based on the quality and uniqueness of each individual piece. Our products are professional technical tools, designed and built to solve problems. We produce few items because we believe in their peculiarity; each one of these is designed for a specific use."