Fastener manufacturing, fastener sales, mold manufacturing, hardware product manufacturing, wholesale of hardware products, sales of building decoration materials, general equipment manufacturing, sales of mechanical equipment, sales of metal materials, research and development of metal products (excluding special equipment manufacturing), technical services, technical development, technical consulting, technical exchanges, technology import and export (except for projects that require technology transfer and technology promotion according to law, and approved projects, business activities are carried out independently according to law with a business license)