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