6 Common metals and their alloys; metal building materials, namely, reinforcing materials of metal for building; transportable buildings of metal; non-electric cables and wires of common metal; ironmongery, namely, small items of metal hardware, namely, metal pipe fittings, metal joinery fittings, elbow joints, crossovers, couplings, tees, reducers, plugs, adaptors, flanged joints, joints, valve connectors, endfeed fittings, compression fittings, threaded fittings; pipes and tubes of metal; safes; grease nipples; pipe fittings of metal; water-pipe valves of metal; drain traps being valves of metal; alloys of common metal; common metals, unwrought or semi-wrought; water pipes of metal; soldering wire of metal; rods of metal for welding, valves, of metal, other than parts of machines; wire of common metal; ring-shaped fittings of metal; metal alloys; nuts of metal; elbows of metal for pipes; pipe muffs of metal; chains of metal; couplings of metal for chains; steam engine boilers