The Petzl AM'D Lock is a manual screw locking carabiner. Its medium sized frame and asymmetric shape give the Am'D Lock exceptional strength and versatility. The Keylock anti-snag gate: All Petzl carabiners are fitted with the patented anti-snag Keylock concept, which makes it very easy to clip. The Keylock is a notch-free gate closing system. It eliminates the need for a notch on the nose of the carabiner, which can snag on ropes, webbing and bolt hangers. Asymmetric shape for exceptional strength to weight ratio. Manual locking system (metallic sleeve): simplifies operation with one hand. Red visual indicator shows when the carabiner is unlocked. Keylock system: snag-free body / gate interface Individually tested.