Castings and forgings, all made of aluminium; rods, screws, nuts, washers, springs, pins, clips and frames; all included in Class 6; structural metallic elements for use in building and in civil engineering construction, and parts and fittings therefor included in Class 6; sheets, strips, shaped sections, wire (other than insulated electric or fuse wire), foils (not for painters or for decorators or silver foil), pipes (other than boiler tubes or parts of machines), nails and rivets, all made wholly or principally of common metal; unwrought and partly wrought common metals.;