6 Fixed structures of metal, aluminum and steel, being conservatories, greenhouses, canopies, awnings and windows for conservatories and greenhouses, and all parts thereof of base metal; metal materials for building and construction, namely, soffits; materials for building and construction in metal, steel and aluminum, namely, soffits; movable constructions of metal, steel and aluminum, namely, greenhouses, conservatories; metal walls, namely, wall panels and tiles, and roofs, namely, roofing; aluminum walls, namely wall panels and tiles, and roofs, namely, roofing; steel walls, namely, wall panels and tiles, and roofs, namely, roofing