6 Common metals and their alloys; common metals, unwrought or semi-wrought, and their alloys; copper, aluminium and their alloys; building materials of metal; pipe fittings and forgings, of the following materials, namely, pipe fittings of copper, aluminium, copper alloys, aluminium and its alloys, steel forgings, unwrought and semi-wrought copper; unwrought and semi-wrought aluminium; copper alloys; aluminium and its alloys; semi-wrought common metals; shaped parts of metal in the form of semi-finished products, namely, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of common metals or its alloys; metallic casting moulds of metal; transportable buildings of copper, aluminium and their alloys; non-electric cables and wires of common metal; metal poles and profiles made of common metals and their alloys, not for electric purposes; pipes and tubes of metal; pipes of copper, aluminium, stainless steel, copper alloys, aluminium and its alloys, stainless steel alloys; insulated pipes of metal; Manifolds of metal for pipelines, namely pipe bundles; pipe connectors of metal; metal valves not being parts of machines; metal fittings for pipes; heat-insulated copper pipes; pipe bundles of copper, aluminium, stainless steel, copper alloys, aluminium and its alloys, stainless steel alloys