... coil spring lock washer1.Standard:ANSI/ASME, DIN, BS, IFI, JIS ISO, GB,etc.,2.Finish:galvanized,nickel plated,black coating ... : Carbon steel,stainless steel Standard: ANSI/ASME, DIN, BS, IFI, JIS ISO, GB,etc., Finish: galvanized,nickel plated,black coating,etc ...