... demension 2.Surface:galvanized,paint... 3.Section:square,rectangle, 17x17x1.2mm Square Hollow Section tube1.Size:specified demension 2 ... .Surface:galvanized,paint,annealed etc. 3.Section: square, rectangle, ellipse, semicircle, arch, sector, triangle, hexagon ... shaped tube, arch shaped tube, rectangular shaped tube, square shaped tube, irregalar shaped tube, etc.special shaped steel ...