Square Washer 1)Standard:DIN,ANSI,BS,JIS,GB 2 ... )Material:Steel,Stainless steel 4)Finish:Zinc,Black,Nickel,TinMetal Square Washer1) Standard: DIN, BS, IFI, JIS, ISO,GB, ... , Black, Nickel-plating, Tin-plating, Chrome- plating, Dacromet,Mechanical Galvanizing, Hot-dip Galvanizing.etc.5) Shape: round , square , curved , taper, ... philosophy of client first,quality second and price third square wave washer