Common metals and their alloys unwrought and semi-worked, for further manufacture; building materials made of metal, namely, steel clips, steel spacers and other connection material made of metal for the production of prefabricated formwork systems, namely brackets, angels, bolts, rods, hooks, cramps, hangers; transportable buildings made of metal; materials of metal for railway tracks; non-electric cables and wires made of metal; ironmongery, namely, components of steel clips for steel spacers; small items of metal hardware, namely, components of steel clips, steel spacers and other connection material made of metal, namely, brackets, angels, bolts, rods, hooks, cramps, hangers; pipes and tubes of metal; metal safes; goods made of metal, namely, components of steel clips, steel spacers and other connection material made of metal, namely, brackets, angels, bolts, rods, hooks, cramps, hangers

Non-metal building materials, namely, prefabricated walls, slabs, stairs, beams, columns and special components, namely, shear punching heads/capitals, ventilation outlets, balconies, parapets, attics, landings, window boards, pitched walls, rounded walls, dormers, ducts; rigid non-metal pipes for building purposes, namely, cable channels, ventilation openings and other pipes and channels included in prefabricated walls, slabs, stairs, beams, columns and special components; asphalt, pitch and bitumen asphalt; transportable buildings not of metal; non-metal prefabricated buildings in the nature of monuments of cement bonded particle boards, concrete and prefabricated walls, slabs, stairs, beams, columns and special components

Building construction; repair of flaws on prefabricated walls, slabs, stairs, beams, columns and special components, as well as flaws and damage on buildings erected by such prefabricated elements; installation of prefabricated walls, slabs, stairs, beams, columns and special components and of cable channels, ventilation openings and other pipes and channels included in such elements of buildings