Large D shape for great handling, huge gate opening and massive strength! At a rated strength of 72 kN, it’s one of the strongest carabiners in the world! Heat-treated, half-load tested (over 8000 lbf.) and built to exacting standards, the ½” Large D is one very fine steel carabiner. Meets current NFPA standards UL Classification G. Made in the U.S.A.