... . finish: zinc plated, 12 mircon, 144 hours SST NUT RETAINER PLATE ASSYMATERIAL: COLD ROLLED STEEL, DC01SURFACE: YELLOW PLATING, 12 MIRCONS, 144 ... . With different finish treatment:anodizing, power-coating, Zinc-Plated, Chrome coated ,Nickel Plated etc.6. tooling way: stamping, bending;punching, welding ... parts (metal stamping products,pressed parts,stamping parts) Nut Retainer plate