The Am''d 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 Am''d Carabiner Is Available In Three Locking System Versions: Manual Screw-lock System, Or Automatic Ball-lock And Twist-lock Systems.