Our largest belay and rappel locker, the Black Diamond Rock Lock carabiner features a keylock nose, is Munter Hitch compatible and can be operated with one hand. Features: Square hinge end holds belay loop securely in place Slightly curved spine maximizes gate opening Keylock nose prevents snagging One-hand operable Screw gate sleeve Type H or HMS connector. For dynamic belaying using a Munter Hitch or belay device.