ASP Black Tactical Hinge Handcuffs (Steel) Tested for durability Forged from high strength stainless steel over molded with black ordnance grade polymer. Key hole and double lock slot on each side of restraint. The lock assembly is unitized and replaceable. Hang packaged. Made using the highest quality materials Flat Contact Surface with fully Radiused Edges, Serial Numbered Recessed Keyway on Each Side of Cuff with Yellow Indicator Double Lock Alert Replaceable Lock Sets Four Point Hinge