... and rating fastening piece; Such as screw, nuts etc. It can be used for valve part ... building and project. We usually use Casting iron, steel, and brass, bronze for our product.You can ... Attack, Amphibious Lathe, Laser Cutting LathesMaterialMachiningServiceAluminium, Copper , Steel, Stainless Steel(SUS), Iron, Nylon ,Chilled cast iron, Nodular cast ... our company and ability. Series steel Hex nuts