6 Common metals and their alloys and semi-finished products made of these materials; goods and materials of common metal used for storage, wrapping, packaging and sheltering purposes, containers of metal (storage, transport), buildings of metal, frames of metal for building, poles of metal for building, metal boxes, packaging containers of metal, aluminium foil, fences made of metal, guard barriers of metal, metal tubes, storage containers of metal, metal containers for the transportation of goods, ladders of metal; ventilation ducts, vents, vent covers, pipes, chimney caps, manhole covers, grilles of metal for ventilation, heating, sewage, telephone, underground electricity and air conditioning installations; metal panels or boards (non-luminous and non-mechanical) used for signalling, route showing, publicity purposes, signboards of metal, advertisement columns of metal, signaling panels of metal, non-luminous and non-mechanical traffic signs of metal; pipes of metal for transportation of liquids and gas, drilling pipes of metal and their metal fittings, valves of metal, couplings of metal for pipes, elbows of metal for pipes, clips of metal for pipes, connectors of metal for pipes; works of art made of common metals or their alloys.