Steel structure, light steel structure, grid structure, color steel panel house, integrated house, enclosureProduction, design, sales, and installation of gears and their supporting products; Soil and building materialsMaterials, decorative materials (excluding hazardous chemicals), lifting equipment, water and electricitySales and installation of pipelines (excluding pressure pipelines) and lighting tiles; steelsSales of building materials and hardware labor protection products; Steel structure design and constructionArchitectural engineering design and construction; Construction labor subcontracting.