Extrema Ratio

Extrema Ratio – Technical Knives from Italy

Extrema Ratio was founded in 1997 in Prato, Tuscany, with a focus on crafting robust, functional knives for military, police, and rescue applications.

The product range includes combat fixed blades, folding knives, survival tools, machetes, and kukris. Manufacturing merges modern processes—such as CNC machining and vacuum heat treatment—with skilled hand-finishing and sharpening.

Materials include high-grade steels (e.g., Böhler N690, M390) and handle compounds like Forprene and Anticorodal. Ergonomics and materials are refined through collaboration with military units, rescue professionals, and academic institutions. The company is ISO 9001 certified and registered as a defense supplier (NATO CAGE code).