Learn about Wheatland Tube’s American-made steel electrical conduit, standard and fire sprinkler pipe, fence framework, mechanical tube and energy tubulars; tube mill producing hollow structural sections (hss) in square, rectangular or round; available in 1 in; square through 16 in; square & equivalent rectangles & 1 / 315 in; od through 20 in; od in gauges. 065 in; up to. 625 ...