Grivel Mega K6N HMS Screwgate Carabiner Robust and durable HMS safety carabiner. Featuring a screw-lock, the Mega K6N HMS Carabiner is ideal for occasional use in dirty environments where the conditions could cause an automatic locking system to jam. The screw-lock can be easily opened and either locked or not according to the user's needs. A keylock system also features on the carabiner to ensure optimal efficiency. It works to avoid any involuntary snagging of the carabiner onto anchors, ropes or harness gear. The HMS shape allows you to have the necessary space for the rope to run, for the insertion of the clove hitch and in some cases for the insertion of several of them. Lastly, the carabiner has been constructed using 7075 aluminum which offers the best ratio between weight, strength and durability.