... rectangle, ellipse, semicircle, arch, sector, triangle, hexagon and octagon, etc Square Hollow Section Pipe/Steel Pipe/Tube 1-Finishing ... rectangle, ellipse, semicircle, arch, sector, triangle, hexagon and octagon, etc 5-Available Diameter 20-600mm or other requests6-Packing ... crane, automobile and structure, etc. 9- Other products: octagon shaped tube, hexagon shaped tube, ellipse shaped tube, arch ...