6 Common metals and their alloys; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery and small items of metal hardware, namely, metal pipe fittings, metal joinery fittings, elbow joints for pipes, crossovers for pipes, pipe couplings, pipe tees, pipe reducers, plugs, pipe adaptors, flanged pipe joints, pipe joints, pipe valve connectors, endfeed pipe fittings, compression pipe fittings, threaded pipe fittings; pipes and tubes of metal; safes; hardware of common metal, namely, metal pipe fittings, metal joinery fittings, elbow joints for pipes, crossovers for pipes, pipe couplings, pipe tees, pipe reducers, plugs, pipe adaptors, flanged pipe joints, pipe joints, pipe valve connectors, endfeed pipe fittings, compression pipe fittings, threaded pipe fittings; grease nipples; pipe fittings of metal; water-pipe valves of metal; drain traps valves of metal; alloys of common metal; common metals, unwrought or semi-wrought; water pipes of metal; water installation 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; nuts of metal; elbows of metal for pipes; pipe muffs of metal; chains of metal; couplings of metal for chains