Section 15 Base metals and articles of base metal 76 Aluminium and articles thereof 76 10 Aluminium structures (excluding prefabricated buildings of heading 9406) and parts of structures (for example, bridges and bridge-sections, towers, lattice masts, roofs, roofing frameworks, doors and windows and their frames and thresholds for doors, balustrades, pillars and columns); aluminium plates, rods, profiles, tubes and the like, prepared for use in structures Commodity Code Description 76 10 10 - Doors, windows and their frames and thresholds for doors 76 10 90 - - - Complete structures