Unwrought or semi-wrought common metals and alloys of common metals; metal in the form of sheets, coils, strips, slabs and ingots; precoated metal sheets, coils and strips; precoated steel building materials including wall sheeting and roofing; metal roof and wall cladding, ceiling panels, ceiling battens, trusses, purlins; structural decking; roof and floor decking; metal formwork and reinforcing materials for buildings; metal channels, metal angles; knobs, bolts, nuts, screws, rivets, nails, brackets, clips and clamps, all of metal