Extrema Ratio specialise in military specification knives, conforming to military standards and precision manufacture. This level of expertise makes their knives some of the best available today. Each item is quality controlled by skilled craftsmen before leaving the factory. The Pretorian knife, available with Testudo or Geocamo styling, are superb fixed blades. The Tanto model has the same N690 satinless steel which will withstand the harshest of environments whilst the handle has an almost sandpaper texture, guaranteeing it will not slip out of the hand. It is provided with a tough plastic sheath and nylon harness.