Detailed Product Description 1.Item: Rectangular hollow section2.Standard: GB, ASTM, BS, JIS3.Material: Q195, Q215, Q235 Q345B, X42, Gr. B4. Specification: OD: 10*20mm-100*500mm, WT: 0.6mm-12mm specificationWall thicknessspecificationWall thicknessmmmmmmmm400*2004.25-13.5140*802.5-8400*10011.5-13.5120*1002.5-10200*3003.0-4.0120*801.8-10300*1504.25-9.75120*601.8-6300*1003.25-3.7580*601.8-6250*1502 ...