Extrema Ratio Ultramarine Black N690 Fixed Blade Knife

The Ultramarine knife, made by Extrema Ratio, is a top-of-the-line diving knife designed specifically for elite military use. Its blade is made of thick Bohler N690 stainless steel, which is coated with a non-reflective and corrosion-resistant Mil-C-13924 finish. The dagger blade has partial serrations and also includes an integrated strap cutter. The handle is wrapped in nylon, providing a secure and slip-resistant grip. Additionally, the knife comes with a scuba ankle sheath for easy access.