niceeshop(TM) 316 Stainless Steel Screw Gate Rock Lock Climbing Gear Carabiner Material:AISI316 Stainless steel;Thickness:8mm(0.31inch); Length:7.5cm/approx.2.95inches Mountaineering buckle climbing master lock safety lock SWL:770KG;BL:3850KG;Widely used in dog chain, belt and so on Used as connection between objects,can open and close smoothly 3 different sizes for option