... . Size:20x20-400x400mm. TCT:0.3-12.0mm hollow rectangular steel tube1)Material: Q195/Q215/Q235,20#,45# etc ... Surface: Galvanized or naked as customers' need;5)Product Type: Square pipe, Rectangular tubes, ERW tubes, Seamless &Welded steel pipe, ... Galvanized steel pipe, etc.hollow rectangular steel tube Product name hollow rectangular steel tubeSpecification20mm*20mm-400m*400mmMaterial of Square ...