Detailed Product Description Detailed Product Description 1. Item: square & rectangular hollow section2. Standard: GB, ASTM, BS, JIS, 3. Material: Q195, Q215, Q235, Q345B, X42, Gr. B4. Specification: OD: 10*20mm-100*500mm;WT: 0.6mm-12mm; Length: 5.8 meters for 20' container, 6 meters to 12 meters for 40' container. Measurement(mm)Wall thickness(mm)20x201.3-1.725x251.3-1.720x401.3-3.025x501.3-3. ...