Long type main link and sublink: 1.Material:Quality alloy steel , 2.Safety guarantee:4 times safety factor,2.5times proof load Long type main link and sublink:1.Material:Quality alloy steel ,2.Safety guarantee:4 times safety factor,2.5times proof load3.Surface :Polishing ,blackening,immersed lacquer,spray lacquer ,plastication ,zinc-plated4.Strength Grade :805.Warning :Sublink included angle must ...