展开D-shaped locking carabiner for attaching devices to a harness. The AmD asymmetrical aluminum carabiner has a D shape best suited for connecting a belay system or for holding equipment. Its ergonomics and Keylock system facilitate manipulations, even when wearing gloves. The AmD carabiner is available in three locking system versions: manual SCREW-LOCK system, or automatic BALL-LOCK and TWIST-LOCK systems.