6 Building and construction materials and elements of metal, namely, removable screw joints; common metals and their alloys; transportable buildings of metal; metal materials for railway construction; metal cable wire; fastening and connection elements, in particular bolts, screws, nuts, of metal; connectors in the nature of small items of metal hardware, namely, screws, screws for thin sheet-metal joints, metal nuts, rivets, bolts, nails, counter supports, hinges, support sleeves, joinery fittings, dowels, plates and load distribution discs; metal profile rails; fasteners of common metal, namely, nuts, rivets, bolts, nails, counter supports, hinges, support sleeves, joinery fittings, dowels, plates and load distribution discs; fixing anchors of metal; cotter pins of metal; clips of metal for cables and pipes; metallic mounting brackets for general use; fixing nails; metal fastening plates; metal shims; metal hold down bolts; metal fasteners for building, namely, bolts, nuts, nails, rivets, and screws; metal joinery fittings; metal connectors for friction welding, namely, steel friction studs, aluminum upper plates and stainless steel base plates; metal fasteners for friction welding, namely, steel friction studs, aluminum upper plates and stainless steel base plates; hinges of metal for the fixing of pipes; fasteners of common metal, namely, metal circlips; metal dowels; metal joints for pipes and tubes; threaded metal connectors for pipes and tubes; metal cable junction sleeves