... 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, ... shaped tube, hexagon shaped tube, ellipse shaped tube, arch shaped tube, rectangular shaped tube, square shaped tube, irregalar shaped tube, etc.special shaped ...