Section 15 Base metals and articles of base metal 76 Aluminium and articles thereof 76 10 Aluminium structures and parts of structures; plates, rods... therefor 76 10 90 Aluminium structure and parts of structures..., nes Commodity Code Description 76 10 90 00 Aluminium structure and parts of structures..., nes 76 10 90 30 Internal or external floating roofs for petroleum storage tanks 76 10 90 91 Bridges and bridge-sections; towers or lattice masts 76 10 90 99 Other