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 lbs.) and built to exacting standards, the " Steel Standard D is one very fine steel carabiner. Specifications: 1 kN = 225 lbs of force Strength Closed: 72 kN