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