... :specified demension 2.Surface:galvanized,paint,annealed etc. 3.Section: square, rectangle, ellipse, semicircle, arch, sector, ... from1.0mm-20mm)3-Length: customized ( 3m/5.8/6m usually)4-Section: square, rectangle, ellipse, semicircle, arch, sector, ... special shaped steel pipe/tubecustom profile steel hollow sectionspecial section steel pipes/tubescustom design & demensionspecial design & demensions ...