Qingdao Sangao Metal Structure Co.,Ltd is a professional cone shaped pipe manufacturer and factory,Website:http://www.china-weldedpipe.com, ... we have been exporting high quality cone shaped pipe made in China for years, welcome to contact us ... rust oil, hot galvanized, cold galvanized, 3PE,etc.PackagePlastic caps on both ends, Steel bundle, Woven bag or acc. to customers ...