Petzl Am'D Triact-Lock Carabiner The Asymmetrical aluminum Am'D carabiner D shape. Suited for connection to diverse equipment such as harnesses or positioning lanyards. Its fluid non-snag interior design and TRACK-LOCK system is used for quick and easy opening and closing while providing the security of a screw lock but without fumbling associated with a screw gate. Use for climbing, abseiling, lifting of gear, quick attachment of lines or buddy recovery.