Zinc-Galvanized Steel Carabiner Spring Snap Link Hook - Choose from 6 Sizes 40mm to 140mm - 1-1/2 to 5-1/2 Link size: 100mm x 10mm Versatile binding, rigging and anchoring hardware - quick connect/disconnect 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 and corrosion resistance Length x diameter: 100mm x 10mm (4 x 3/8-inch) 500 lbs/227 kg working load limit; 30mm inside width tapers to 12mm at eye with a 12mm maximum gate opening