Elk River steel ladder carabiner with auto twist-lock and pin. All carabiners are made of high strength materials. All models are self locking and closing for added safety. Carabiners are used to connect lanyards and lifelines to anchorage points. Always check that the gate is secure and locked before use. Fall rated. 1-1/8-inches x 7-1/8-inches x 4-1/2-inches. 1-1/8-inches gate opening.