Extrema Ratio Knives
Extrema Ratio Knives were started in 1997 by Maurizio Castrati and Mauro Chiostri. Founded on the demands of professional tactical knife users, Extrema Ratio is now one of the top Italian producers of tactical knives delivering their products with a unique style. Military, police, and emergency... all their products are studied and realized for the solution of problems, and are both technical and professional tools.