Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 08 COLUMNS), OF IRON OR STEEL, PLATES, RODS, ANGLES, SHAPES, SECTIONS TUBES 73 08 30 DOORS, WINDOWS AND THEIR FRAMES AND THRESHOLDS FOR DOORS Commodity Code Description 73 08 30 00 DOORS, WINDOWS AND THEIR FRAMES AND THRESHOLDS FOR DOORS