Developed to meet the demanding needs of US Coast Guard rescue swimmers Nitrogen enriched alloy that is extremely corrosion resistant Patented feature allows the module and spring to be easily removed with the tool in Spyderco's spring replacement kit without disassembling the entire knife The Autonomy 2 takes all the groundbreaking features of the original Autonomy automatic knife, which was developed to meet the demanding needs of U.S. Coast Guard rescue swimmers, and incorporates them into a design optimized for utilitarian use. Its ergonomic, open-backed handle is built with full stainless steel liners flanked by textured G-10 scales. The easily indexed oversized firing button includes a sliding safety to prevent unintentional activation and extends through the opposite-side liner to maximize lock strength.