Petzl shaped the Am'D Locking Carabiner asymmetrically to accommodate ascenders and descenders for mountaineering, canyoneering, and big wall climbing. This carabiner comes with in various locking styles, from the standard screw-lock to the super secure triact-lock. A weight-savings H-profile and a snag-free keylock nose make the Am-D excellent for any climbing scenario, whether it's a belay or part of an anchor.