... steel, SS-304, SS-302, Aluminum, Brass, Bronze, medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating, Tin ... zinc-plated, blue black zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing etc.Applications Automotive, instrument ... :ZINC PLATED,BLACK OXIDE,HDG,PLAIN,NICKLEPACKING:SMALL BOX head cap screw din912