6 Common metals and their alloys; building materials, building elements or building components of metal or substantially of metal and their alloys, namely, building panels of metal, metal wall boards, facade cassettes of metal; transportable buildings of metal; transportable steel buildings; wall panels of metal; wall claddings and coverings of metal for building, namely, prefabricated walls of metal, metal wall boards, metal wall tiles, clad steel plates and sheets; metal roofing; roof materials and coverings of metal; Sheets of metal; plates of metal for building; metallic roof protection products, namely, ladders, roof bridges and railings; metal roof drainage devices and installations and parts and components therefore, namely, gutters, downspouts, hangers, fasteners, bends, joints, drainshoes, stop-ends, adjustable branch-pipes, connectors, leaf trappers, miter fasteners, screws, extensions, nozzle pieces and protective profiles; doors of metal or substantially of metal; Metal fasteners, namely, screws, nails, rivets, metal fittings being fittings for construction purposes, for building panels, wall claddings and coverings, for roof materials, metal roof drainage devices and installations; Metal fasteners in the nature of fastening strips for building purposes; Metal telescopic sleeves for screws; Ventilation fittings of metal or substantially of metal with and without seals, namely, joints, connectors and bends for connecting ventilation ducts; Metal dampers in the nature of duct dampers for regulating air flows; Metal pipes, tubes, ducts for ventilation and air conditioning installations; Ventilation ducts of metal for ventilating installations and air-conditioning installations; Metal roof vents for ventilation and air conditioning installations used in residential and commercial buildings; Metal grilles for use as a part of ventilation and air conditioning installations; parts of and fittings for all the aforesaid goods