... . finish: zinc plated, 12 mircon, 144 hours SST NUT RETAINER PLATE ASSYMATERIAL: COLD ROLLED STEEL, DC01SURFACE: YELLOW PLATING, 12 MIRCONS, 144 ... TESTstamping:1. Materials: carbon steel, stainless steel, aluminum, brass 2.High precision metal stamping 3. Press from 5MT to 400MT4. Design ... parts (metal stamping products,pressed parts,stamping parts) Nut Retainer plate