... steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze, medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating, Tin-plating, copper ... etc.Testing EquipmentProjecting apparatus, Salt Spray Test, Durometer, and Coating Thickness Tester.WorkforceA group of experienced production technician, ... com all kinds of screw ,machine screw ,stainless steel screw and fasteners