1. Hot-dipped galvanized, 2. 500kv double-circuit, 3. steel angle towers, 4. superior quality. Ningbo Chengzhao International Trade Co., Ltd.is a leading professional exporter in the field of angle steel towers, tube towers (the voltage up to 500kv), telecommunication towers, monopoles, bionic towers, camouflaged mono poles, steel pipes, grating, cable and so on. We also supply all kinds of steel ...