... '' 2)Material:brass,copper,bronze 3)Standard:GB,DIN,BS,ISO,ANSI(IFI) 4)Environmental Finish Products Information: DIN7981/ISO7049: Pan ... steel, Aluminum, Grade.12.9 steel3Standard :GB, DIN, BS, ASTM, ISO, ANSI(IFI), JIS, or as customer's drawing4Size:M3-M64 ... supplier, so you can trust our product quality. Other Products: ISO 7049 self tapping screw