... Steel 2) Alloy Steel 3) Stainless Steel 4) Brass 5) Aluminum 3. Finish: 1) Zinc Clear 2) Zinc Yellow 3) Black ... : C51000, C52100, C54400, etc5.Iron: 1213, 12L14,12156.Aluminum: Al6061, Al6063 SpecificationM1.6-M100ColorPlain, blue plated, white plated, yellow plated,black.StandardISO ...