3/8" Zinc-Plated Steel Steel Carabiner Snap Hook - (2, 5, 10, 20, 25 Packs) 3/8" : A - Snap Opening = 1/2", B - Inside Length = 3-1/4", C - Inside Narrow End = 9/16", Diameter = 3/8", 500 lb Work-load limit Versatile binding, rigging & anchoring hardware - quick connect/dis-connect of ropes, chains, straps Push gate in to open - auto-close spring gate with interlock tooth prevents force open Zinc galvanized steel for superior strength, excellent rust & corrosion resistance