qingdao wuxiao group co.,ltd is the special manufacturer of steel tower,lamp pole ,wind turbine tower ,substain and transmission tower and telecom towers.we have 2880 workers in my factory. with 1300000 square meters factory with ISO cetificate. we also can make them according to your design. and pls give me more details including the lowest and highest tempeture ,altitude and so on.pls don't hesitate to contact me if any question waiting your email and wish to build a long term business relationship b.regards kevin ding qingdao wuxiao group co.,ltd # 533.east lanzhou road,jiaozhou of china kevin.wuxiao()yahoo(dot)com.cn skype:steeltowerkevin