[portable buildings of metal in the nature of transportable buildings of metal; materials of metal for railway tracks; cables and wires out of metal, not for electrical purposes; non-precious metals and alloys thereof;] fastening and connecting elements of metal, namely, screws, screws for thin-sheet-metal connections, [nuts, rivets, bolts, nails, counter fixtures, hinges, supporting sleeves, dowel pins, plates, load distributing disks;] fastening and connecting elements of a metal-plastics c...