screw ,bolt and nut 1.100% quality control , 2. Best Price with ... iron, copper or aluminum etc2) Main equipment: CNC lathe, automatic lathe, hand lathe grinder, thread rollingmachine, tapping drilling machine etc3)Advanced measuring ... , nickel plating or chrome plating,phosphating,Black anodization etc5) Parts are produced according to customers' drawing or sample stainless steel screw and bolt