General items: Sales of metal materials; Steel calendering; Sales of metal products; Sales of mechanical equipment; Sales of metal chains and other metal products; Sales of metal structures; Retail of hardware products; Wholesale of hardware products; Metal cutting services. (except for the items subject to approval according to law, carry out business activities independently according to law with the business license) licensed items: Import and export agency; Import and export of goods. (for projects subject to approval according to law, business activities can be carried out only after approval by relevant departments. The specific business projects shall be subject to the approval documents or licenses of relevant departments)