6 Goods made of common metals and their alloys, namely, metal building materials, namely, beams, supports, sheet metal, metal strips, braces, rods, tubes, girders, wall cladding, brackets, trusses, and studs; transportable buildings of metal, namely, tool sheds, storage sheds, temporary housing, and temporary office accommodations; materials of metal for railway tracks, namely, rails, switches, railroad ties and railway crossovers; non-electric cables and wires of common metal; small items of metal hardware, namely, spikes, screws, nails, bolts, nuts, washers and rivets; pipes and tubes of metal; metal safes