... ,GB 2)Size:M3-M76 3)Finish:Tin,Nickel,Chrome round head washer stainless steel screw1) Standard: DIN, BS, IFI, JIS, ISO ... - plating, Dacromet,Mechanical Galvanizing, Hot-dip Galvanizing.etc.5) Shape: round , square , curved , taper, cup, bowl or according to your request ...