Steel sheets; steel pipes; building boards of metal; stop collars of metal, namely, stop collars for pipes; stops of metal, namely, door stops; strap-hinges of metal; brackets of metal for construction of buildings; framework of metal for buildings, namely, metal beams, door frames; reinforcing materials of metal for building construction, namely, joists, ceiling supports, braces; fittings of metal for buildings, namely, metal joinery fittings, metal pipe fittings; prefabricated buildings of ...