Extrema Ratio Ultramarine N690 Fixed Blade Black

The Ultramarine knife by Extrema Ratio was specifically designed in collaboration with the Naval Experimental Diving Unit of the United States. Its main purpose is to serve as a versatile tool for underwater operations, ensuring safety by eliminating a dangerous piercing tip. This knife is ideal for survival and combat situations underwater. The blade is partially serrated and made of high-quality Bohler N690 stainless steel, which is known for its exceptional durability. To prevent corrosion, the inside-hilt blade tang has undergone a special process. The set includes a carrying case, maintenance spray-can, a Cordura fabric ankle sheath, and two belt clips, allowing for separate use of the inner hard sheath. If you're interested in more tactical knives or are in search of a reliable pocket knife as a companion blade, be sure to explore our collection.