Steel rolling processing; metal material manufacturing; metal product research and development; metal product sales; safety and fire protection metal product manufacturing; metal chain and other metal product manufacturing; metal chain and other metal product sales; metal daily necessities manufacturing; hardware product manufacturing; metal structure manufacturing; metal processing machinery manufacturing; construction metal accessories manufacturing; metal packaging containers and material manufacturing; construction steel product sales; metal material sales; daily miscellaneous products manufacturing; daily miscellaneous products sales; hardware products Research and development; wholesale of hardware products; retail of hardware products; mechanical parts and parts processing; sales of mechanical parts and parts; wholesale of motorcycles and spare parts; manufacturing of electronic components; wholesale of electronic components; retail of electronic components; manufacturing of motorcycle parts and accessories; wholesale of auto parts and accessories; retail of auto parts and accessories; manufacturing of auto parts and accessories; manufacturing of fasteners; sales of fasteners; sales of building materials; sales of building decoration materials; sales of metal structures; (the above business scope does not include sand and gravel).