Steel structure engineering professional contracting level three, urban and road lighting engineering professional contracting level three General items: processing and sales: transmission line towers, steel tube tower series and their iron accessories, fittings, fasteners, full range of communication microwave towers, post and telecommunications iron accessories, fittings, bridge structures, special-shaped formwork, street light poles, highway safety guardrails, columns, sign poles and their steel structure products, electrified railway steel Structural products; hot-dip galvanizing, plastic spraying; full range of foreign trade operations for transmission line towers and communication microwave towers (except for special regulations by the state); providing: technical consulting services; design, manufacturing, and sales: precision molds, precision stamping parts, precision injection molded parts; sales: steel, home appliances; human handling and loading and unloading services