General items: Sales of metal materials; Sales of new metal functional materials; Sales of Non-ferrous metal alloys; Sales of special equipment; Wholesale hardware products; Sales of special labor protection products; Sales of machine parts and components; Sales of building materials; Sales of light building materials; Sales of metal accessories for construction; Sales of metal tools; Sales of metal structures; Sales of non-metallic minerals and products; Sales of construction reinforcing steel products (except for projects subject to approval according to law, independently carry out business activities according to the business license)