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As Black Diamond's largest locking biner, the new Rocklock Keylock has a non-snagging keylock nose. A slightly curved spine maximizes the gate opening and a square hinge end holds your belay loop securely in place. The Rocklock Keylock's large size makes it an excellent choice when using two ropes, wearing gloves or when using a variety of belaying and rappelling techniques. its large capacity can handle multiple clove hitches at belays. Easily operated with one hand.