Proof coil chain, carbon steel, Grade 30 Finish: Self colored or zinc plated Proof coil chain, carbon steel, Grade 30Finish: Self colored or zinc platedStandard: NACM90, NACM96, ASTM 80Size: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 7/8", 1"