RamPro 1Pc Spring Snap Hook Carabiner Stainless Steel Clip Keychain - 3/16 to 5/16-inch, Grade 316 SS (5/16) Grade 316 stainless steel has superior corrosion resistance and greater strength over grade 304 Versatile binding, rigging and anchoring hardware - allows fastest connect/disconnect Push gate in to open - auto-close spring gate with interlock tooth prevents load forcing open Choose from 3 sizes: 3/16 x 2" (5 x 50mm), 1/4 x 2-3/8" (6 x 60mm) & 5/16 x 3-3/16" (8 x 80mm) Allows quick connect/disconnect of ropes, chains & straps; see desc. for size/load specifications