Extrema Ratio

Lifetime Tools. Sharp, strong, timeless. Since 1997. We craft exceptional knives for those who live for adventure: outdoor, survival, tactical, bushcraft, and EDC.

Advanced technology and expert craftsmanship come together to create unique tools, meticulously tested and built to last a lifetime. 

Every knife is designed to go wherever you do, delivering outstanding performance even in the toughest conditions.

With decades of experience working alongside elite units of the Italian and international armed forces, we have become an icon in the development of knives that stand for reliability and innovation.