Unlike most locking carabiners, Petzl designed its Spirit 3D Screw Lock Carabiner for climbing specific situations like belay stations and top rope anchors. Made solely out of aluminum, this is Petzl's lightest carabiner, and its H shaped cross section gives it a surprising amount of durability with a superb strength to weight ratio. It has a very compact size to keep anchors clean, and its size helps accommodate multiple climbers at a single belay station. Despite its compact quality, this biner has a wide contact surface for better rope glide that also reduces wear on the carabiner for excellent longevity. The screw lock sleeve is easy to use and provides efficient clipping, and the visual indicator clearly points out whether it's locked or not. This pear shaped carabiner also features a keylock nose for snag free clipping every time.