Detailed Product Description Item name:nut1) Material: Different kinds of stainless steel, iron, copper or aluminum etc.2) Main equipment: 5 ton to 300 ton punch, CNC lathe, automatic lathe,hand lathe grinder, rolling wire machine, thread rolling machine, tapping drilling machine,cold header and so on in the factory.3) Surface treatment: Zinc plating,polishing, nickel plating or chrome plating, ...