6 Ores of non-precious metal; common metals and their alloys, unwrought or semi-wrought and semi-finished products made of these materials, namely, castings, foils, powder, and rolled, drawn or extruded semi-finished articles; goods and materials of common metal used for storage, wrapping, packaging and sheltering purposes, namely, metal storage sheds, storage pallets of metal, metal storage tanks; general purpose storage containers of metal; transportable, prefabricated buildings of metal, frames of metal for building, poles of metal for building, metal boxes, industrial packaging containers of metal, aluminium foil, fences made of metal, crash guard barriers of metal; metal tubes; storage containers of metal; metal containers for the transportation of goods; ladders of metal; latticework of metal; doors, windows, shutters, jalousies and their cases and fittings, all of metal; non-electric cables and wires of metal; ironmongery, being small hardware of metal, namely, pins, hooks, sleeves, springs, buckles of common metal, washers, nuts; ventilation ducts, roof vents in residential and commercial buildings, vent covers for HVAC ducts, pipes, chimney caps, manhole covers, and grilles of metal, all for ventilation, heating, sewage, telephone, underground electricity and air conditioning installations; Non-luminous and non-mechanical metal panels or boards in the nature of signs used for signalling, route showing, and publicity purposes; signboards of metal; advertisement columns of metal; signalling panels of metal in the nature of signs; non-luminous and non-mechanical traffic signs of metal; pipes of metal for transportation of liquids and gas, drilling pipes of metal and their metal fittings, valves of metal other than parts of machines; couplings of metal for pipes, elbows of metal for pipes, clips of metal for pipes, connectors of metal for pipes; safes and strong boxes of metal; metal railway materials, metal rails, metal railway ties, railway switches of metal; bollards of metal, floating docks of metal, mooring buoys of metal, anchors; metal moulds for casting, other than machine parts; works of art made of common metals or their alloys; metal closures for bottles, containers, bags, bottle caps of metal; metal poles; metal pallets and metal ropes for lifting, loading and transportation purposes; metal hangers, ties, straps, tapes and bands used for load-lifting and load-carrying; wheel chocks made primarily of metal