Steel Tube manufacturer / supplier in China, offering Welded Structure Support/Welding Assembly/Welding Structure Members/Steel Support Customization, PC Threaded Steel Sleeve/Pre-Buried Steel Bar Sleeve/Galvanized Coupling Sleeve/Joint Sleeve/Reinforced Connecting Sleeve, Grade III Steel Sleeve/ Reinforced Connecting Sleeve/Htrb630 Connect Steel Sleeve/Customized Sleeve and so on.