welded rectangular steel tube section shape: rectangular material: steel size:20X30X1.5mm to 200x400x11. ... , 2.0mm, 2.2mm,2.5-4.0mm, 4.25-5.0mm,5.25-6.0mm40x60mm0.7/0.8mm, 1.7mm, 1.8mm, 2 ... .5-2.75mm, 3.0-4.0mm, 4.5-6.0mm, 6.5-15mm100x250mm2.5-2.75mm, 3.0-4.0mm, 4.5-6.0mm, 6 ... .5-15mm100x300mm3.0-3.25mm, 3.5-3.75mm ...