... 1000mm 3)Raw Material:Q195,Q235Square steel tube Size:15*15mm-400*400mm Wall thickness:0. ... -coating, black paintingPackingpacked in bundle for small size, single piece for large sizeUsedConstruction, transportation, shipbuilding, water project, furniture ... Section)pre-galvaznized Sqaure,Rectangular TubesProduct Detail Terms: SIZE:15x15-400x400mm 15x20-400x300mmSIZE TORLERENCE:+/-0.03mmWALL THICKNESS: ...