The Axis Big D Triplock is the one carabiner that will never have you wondering if your carabiner is done up correctly. It always closes securely with its automatic triple locking mechanism, that will not work it's way loose, unlike a standard screw gate carabiner. This eliminates the risk of having it accidently attaching onto something or undoing. It has a snag free nose, so nothing gets caught as you unclip it. Less lost gear and peice of mind are why most river guides and kayakers choose to go with this auto locking carabiner.