方（結構）管
方結構管 STRUCTURAL STEEL TUBE LENGTHS - 20 and 40 Ft. RANDOM + 20 and 40 ft. lgths available - Grade B only ++ Grade C
方（電焊）管
方形 ELECTRIC WELDED STEEL TUBING LOW CARBON MECHANICAL LENGTHS - 20 FT. RANDOM SQUARE STRUCTURAL STEEL TUBE LENGTHS - 20 and 40 Ft. RANDOM
