... ,GB 2)Size:M3-M76 3)Material:Steel,Stainless steel 4)Finish:Zinc,Black,Nickel Flat Washer1) Standard: DIN, BS, IFI, JIS, ISO ... ,GB,ANSI,ASME,Non-Standard2) Size: M3–M763) Material: Carbon Steel, Alloy Steel, Stainless Steel ... , and machining, also CNC machine, can do OEM order. din9021 flat washer