... :ZW,ZB,ZY,Nickel, ZP.else 4)Tolerance:0.01 Square Washer 1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI ... Steel, Brass, Aluminum, etc.4) Finish: Zinc Clear, Zinc Yellow, Black, Nickel-plating, Tin-plating, Chrome- plating, Dacromet,Mechanical Galvanizing, Hot ... -dip Galvanizing.etc.5) Shape: round , square , curved , taper, cup, bowl or according to your request.6 ...