... )Material:Steel,Stainless steel 4)Finish:Zinc,Black,Nickel,Tin SpecificationsFlat Washer 1)Standard:DIN,ANSI,BS,JIS,GB ... etc.4) Finish: Zinc Clear, Zinc Yellow, Black, Nickel-plating, Tin-plating, Chrome- plating, Dacromet,Mechanical Galvanizing, Hot-dip Galvanizing.etc.5) Shape: ... Working Process Include: cold punching, and machining, also CNC machine, can do OEM order.10) Experience: we have over ...