... square hollow section: Material: Q195, Q215, Q235, Q345B, X42, Gr. B supplying square hollow section:hollow section, good quallity and attractive ... , high frequency welded3. MaterialQ195---Q2354. Size a. side length15mm--600mm b. W.T.0.3mm--13.5mm5. LengthMax 13 meters6. StandardGB/T6728 ... T/T the balance 70% after seeing the copy of B/L6. Packing: international exporting package, or according to our ...