6 Base metals and their alloys; metal building materials; metalware and small hardware; metal tubes, screws and mass-produced metal parts of all kinds, including nuts, rivets, pins, nails, fittings, dowels, plates and load distribution discs; fastening elements and devices for industry and the building trade, as well as their components and accessories of metal; fastening bolts; metal profiled rails; window frames of metal; fittings and hinges of metal