Heavy Duty Steel locking carabiner - This heavy duty carabiner can be used to attach swing side snatch blocks, slings or rope end accessories when extra strength is required. Zinc plated with anodized aluminum screw gate lock. Its wide opening gate is appreciated since it opens on the side, letting the user more room to play with. 15700 lb is the Minimum Breaking Strength observed during a destructive test. You should divide it by an appropriate safety factor.