... , Q215, Q235, Q345B, X42, Gr. B square hollow section of best quality:hollow section, good quallity and attractive price 1.Item: hollow ... section2.Standard: GB, ASTM, BS, JIS, 3.Material: Q195, Q215, Q235, Q345B, X42, Gr. B4.Specification: OD ... 30 days after the order signed square hollow section of best quality