General items: Sales of metal products; New metal functional materials sales; High quality special steel materials sales; Sales of metal chains and other metal products; Metal material sales; Windows and doors sales; Metal structure sales; Hardware wholesale; Hardware products retail; Sales of building steel products; Office supplies sales; Building materials sales; Construction metal accessories sales; Metal tools sales; Sisheng metal and its products sales. (Except for the projects subject to approval according to law, independently carry out business activities according to law with the business license) Permitted projects: All kinds of construction activities; Import and export of goods. (For projects that are subject to approval according to law, business activities can only be carried out with the approval of relevant departments. The specific business projects shall be subject to the approval documents or licenses of relevant departments. )