... mm):any thickness Qingdao Wefsun Metal Material Co., Ltd. located in the beautiful Jiaodong peninsula east ... Co., Ltd, Qingdao Sanshan Metal Material Co., Ltd, Qingdao Kaimingyuan International Trading Co., Ltd, Qingdao Wofeiteng Steel Pipe Co., Ltd and Qingdao ... Woming Steel Pipe Co.,Ltd,were ...