hollow steel bars; cold frames [structures] made of metal; building structures made of metal; fabricated metal components for building foundations [construction materials]; structural steels; metal slabs for building; beams of common metal for building; slabs of metal for building; rolled steel; rolled steels; metal reinforcement materials for building; metal materials for construction; construction materials made of metal; steel frames for building; columns of metal for building; building castings of metal alloys; steel structures; metal materials for building; metal building materials; building materials of metal; building materials made of metal; construction materials of metal; reinforcing materials of metal for building; framework of metal for building; reinforcing materials, of metal, for concrete; steel constructions; steel buildings; frames of metal for building; steel; steel alloys; steel sheets; reinforcement mesh of metal; wire mesh; welded wire mesh; hot-rolled steel bars; extruded aluminum sections; extruded aluminium sections