Unwrought or semi-wrought common metals and alloys of common metals; metal in the form of sheets, coil, strips, plates, bars, rods, slabs and ingots; structural steel; metal roof and wall cladding, ceiling battens, trusses, purlins, structural decking, metal formwork and reinforcing materials for buildings; metal building frames, framing sections and accessories thereto for houses and commercial buildings; transportable buildings of metal; metal fencing materials; pipes and tubes of metal; chains of metal, wires of metal; metal channels, metal angles; knobs, bolts, latches for doors; nuts, bolts, screws, rivets, nails, brackets, clips and clamps, all of metal