1)Cup washer/metal washer 2)Material:Steel 3)Standard:DIN,ANSI, ... 4)Size:M3-M76 5)Finish:Plain,Zinc,Black 1)Material:made of steel 2) Standard: DIN, BS, IFI, JIS, ISO,GB ... , Dacromet,Galvanized, H.D.G5) Shape: round , square , curved , taper, cup, bowl 6) Packing:in Nylon bag,box,then pack on ...