It has an excellent strength-to-weight ratio. Petzl's AM'D Triact-Lock Carabiner is an asymmetrical locking carabiner that has been specially adapted for attaching equipment (rope clamps, etc.) and for use at the end of a lanyard. This carabiner has three features that make it stand out. First, the Keylock nose of the carabiner prevents the frustrating snag that happens with most tooth-type carabiners. Second, the three-step locking gate, although difficult to use, is a great feature when extra security is important.