Extrema Ratio Vipera

VIPERA is born from a fusion of tactical and survival worlds, combining speed of use, robustness, and precision in a knife weighing less than 100 grams. Featuring an elongated drop-point blade with a full-flat, narrow-edge sharpness, it offers penetration, a smooth cut, and a hardness of up to 61 HRC. It is available in two high-performance steels, both with excellent edge retention and corrosion resistance. The ergonomic handle with integrated guard ensures maximum control in all conditions, while the ASPIS nylon sheath allows for stable and versatile carrying. VIPERA Nitrogen (Stone Washed, HCS, Ranger Green) This variant is designed for outdoor, survival, bushcraft, and prepping users: areas where reliability in the field, weather resistance, and ease of maintenance are essential. Nitrogen-filled steel maintains excellent edge retention, combined with excellent rust resistance, and, above all, is easier to resharpen than M390. The increased resilience makes these models more tolerant to the abuse typical of a field environment. Technical insight into nitrogen-filled steels Nitrogen-filled steels are alloys in which nitrogen is used as an alloying element instead of, or in addition to, carbon. While nitrogen is less effective than carbon in hardening the martensitic matrix, it has the advantage of forming stable compounds with chromium to a much lesser extent. This allows a greater amount of chromium to be retained in solid solution, improving corrosion resistance. Furthermore, nitrogen contributes to the hardness and stability of the structure, giving these steels a good balance between hardness, toughness, and corrosion resistance. Compared to traditional martensitic steels, nitrogen-filled steels can therefore offer a better combination of mechanical properties and chemical resistance, while maintaining good machinability and sharpening characteristics.