Washer 1)Standard:DIN,ANSI,BS,JIS,GB 2)Size:M3- ... :Steel,Stainless steel 4)Finish:Zinc,Black,Nickel,Tin SpecificationsFlat Washer 1)Standard:DIN,ANSI,BS,JIS,GB 2)Size:M3 ... ,Mechanical Galvanizing, Hot-dip Galvanizing.etc.5) Shape: round , square , curved , taper, cup, bowl or according to your request.6) Surface Condition ...