... :Steel,Stainless steel 4)Finish:Zinc,Black,Nickel,Tin Metal Cup Washer1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI,ASME ... , Hot-dip Galvanizing.etc.5) Shape: round , square , curved , taper, cup, bowl or according to your request.6) Surface Condition: remove ... are avaliable for us.9) Working Process Include: cold punching, and machining, also CNC machine, can do OEM order. cup washer for stamping