STRUCTURES (EXCLUDING PREFABRICATED BUILDINGS OF HEADING 94.06) AND PARTS OF STRUCTURES (FOR EXAMPLE, BRIDGES AND BRIDGE SECTIONS, LOCK GATES, TOWERS, LATTICE MASTS, ROOFS, ROOFING FRAME WORKS, DOORS AND WINDOWS AND THEIR FRAMES AND THRESHOLDS FOR DOORS, SHUTTERS, BALUSTRADES, PILLARS AND COLUMNS), OF IRON OR STEEL; PLATES, RODS, ANGLES, SHAPES, SECTIONS, TUBES AND THE LIKE, PREPARED FOR USE IN STRUCTURES, OF IRON OR STEEL