Metal building materials; metal building products; metal materials for building; metal materials for construction; metal articles for use in building; metal articles for use in construction; apparatus of metal for securing; architectural fasteners of metal; architectural fittings of metal; architectural hardware made of common metals; products made of metal for use in building and construction; products of metal for use in structural engineering; building components of metal; building extensions (structures) of metal; building fittings of metal; building parts of metal; couplings (joints) made of metal for pipes; couplings (joints) of made of metal for tubes; metal joint connectors for ducts; metal jointing materials for use in building; metal jointing materials for use in construction; non-electric couplers of metal other than parts of machines; structural support members of metal; metal adaptors for plastic pipes (other than parts of machines or sanitary installations); insulation fixing apparatus of metal; jointing articles of metal (non-electric); fixing devices of metal; fixing elements made of metal; fittings of metal for building; fittings of metal for compressed air ducts; fittings of metal for metallic tubes; fitting of metal for pipes; expansion joints of metal; conduit fittings of metal (non-electric); connection elements (non-electric); connectors of metal for pipes; connectors of metal for tubes; articles of metal hardware for architectural purposes; attachment devices of metal; non-electric ducting conduit installations of metal; non-electric ducting conduits of metal