Manufacture of fasteners; sales of fasteners; manufacture of building decoration, water and heating pipeline parts, and other building metal products; sales of metal products; manufacture of power facility equipment; sales of power facility equipment; manufacture of communication equipment; sales of communication equipment; manufacture of photovoltaic equipment and components; sales of photovoltaic equipment and components; manufacture of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; manufacture of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacture of building metal accessories; sales of building metal accessories; manufacture of auto parts and accessories; wholesale of auto parts; manufacture of mechanical and electrical equipment; sales of mechanical and electrical equipment; manufacture of metal structures; sales of metal structures; wholesale of hardware products; sales of electronic components and electromechanical component equipment; sales of non-ferrous metal alloys; sales of metal materials; sales of traffic and public management signs; metal surface treatment and heat treatment processing; technical services, technology development, technology consulting, technology exchange, technology transfer, technology promotion; import and export of goods; import and export of technology.