Petzl AmD Screw-Lock Carabiner Spring 2009 The Am D Screw-Lock Carabiner by Petzl is a manual locking multi-purpose carabiner for connecting devices to harness or to use at the end of a lanyard. Red band indicates when the carabiner is unlocked. Recommended for dirty environments where dust and dirt could cause an automatic locking mechanism to malfunction. Specifications: Weight: 75 g Major Strength: 28 kN Minor Strength: 7 kN Gate Open Strength: 8 kN Gate Opening: 21 mm Certification: CE Features: Asymmetric shape for an exceptional strength to weight ratio. When loaded, the carabiner is oriented in the optimal working axis. Key lock System for snag-free body / gate interface. With manual locking system Screw-Lock or automatic locking system Ball-Lock, Triact-Lock.