STRUCTURES (EXCLUDINGPREFABRICATED BUILDINGS OFHEADING 9406) AND PARTS OFSTRUCTURES (FOR EXAMPLE, BRIDGESAND BRIDGE-SECTIONS, LOCK-GATES,TOWERS, LATTICE MASTS, ROOFS,ROOFING FRAMEWORKS, DOORS ANDWINDOWS AND THEIR FRAMES ANDTHRESHOLDS FOR DOORS, SHUTTERS,BALUSTRADES, PILLARS ANDCOLUMNS), OF IRON OR STEEL; PLATES, RODS, ANGLES, SHAPES, SECTIONS, TUBES AND THE LIKE,PREPARED FOR USE IN STRUCTURES OF IRON OR STEEL.
HS codes falls under this category.