... 3)Material:Steel,Stainless steel 4)Finish:Plain,Zinc,Black Cup Washer1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI, ... , 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) Surface Condition: remove ...