1. all kinds of power towers, 2. transmission towers, 3. the range of voltage: 35kv up to 1000kv 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 ...