... , ellipse, semicircle, arch, sector, triangle, hexagon and octagon, etc Square Hollow Section Pipe/Steel Pipe/Tube 1-Finishing: galvanized,paint,annealed etc.2 ... , automobile and structure, etc. 9- Other products: octagon shaped tube, hexagon shaped tube, ellipse shaped tube, arch shaped tube, rectangular shaped tube, square shaped tube, irregalar shaped tube, etc ...