... :specified demension 2.Surface:galvanized,paint,annealed etc. 3.Section: square, rectangle, ellipse, semicircle, arch, sector, ... triangle, hexagon and octagon, etc Square Hollow Section Pipe/Steel Pipe/Tube 1-Finishing: galvanized,paint,annealed ... special shaped steel pipe/tubecustom profile steel hollow sectionspecial section steel pipes/tubescustom design & demensionspecial design & demensions ...