... , Q345B, X42, Gr. B supplying square hollow section:hollow section, good quallity and attractive price 1.Item: hollow section2.Standard: GB, ASTM, BS ... *15mm-400*400mm, WT: 0.6mm-12mm 1. Commodity specificationsSquare hollow section2. Process methodCold drown, high frequency welded3. MaterialQ195---Q2354. Size ... time: within 30 days after the order signed supplying square hollow section