This is the UK Remora HYDRALLOY Blunt Tip Dive Rescue Knife Features: Attaches permanently to B.C. or regulator hose so you won&';t forget it UK&';s own HYDRALLOY steel blade for durability and corrosion resistance Serrated knife cuts through rope & fishing line Sheath attachment kit included for BC strap, pocket or 1/2 inch air hose The non-corroding Remora(TM) HYDRALLOYA(R) BC knife is the one emergency knife all divers should wear. Small size, attachments for a belt, hose, or fabric, and no maintenance design make the Remora the emergency knife for all divers.