... ,annealed etc. 3.Section: square, rectangle, ellipse, semicircle, arch, sector, triangle, hexagon and octagon, etc Square Hollow Section ... 6m usually)4-Section: square, rectangle, ellipse, semicircle, arch, sector, triangle, hexagon and octagon, etc 5-Available Diameter ... shaped tube, hexagon shaped tube, ellipse shaped tube, arch shaped tube, rectangular shaped tube, square shaped tube, irregalar ...