6 Common metals and their alloys, unwrought or semi-wrought; semi-finished products of common metals and their alloys, namely, rods, ingots, plates, sheets, strips, foils; building materials of metal; transportable buildings of metal; windows of metal, window frames of metal; doors of metal, door frames of metal; folding shutters of metal for windows and doors; roller shutters of metal for windows and doors; fly screens of metal; gates of metal; staircases of metal; parts of metal for staircases, namely, stringers of staircases, stair treads, hand railings, banisters, banister rods; ladders of metal; fittings of metal for windows, for doors, for gates, for staircases, for furniture and for folding shutters and roller shutters for windows and doors; window handles and door handles of metal; non-electric and non-electronic locks of metal not for vehicles; fixing devices of metal, namely, bolts of metal, screws of metal, plugs of metal, nuts of metal, washers of metal, rivets of metal, nails of metal; non-electric wires of metal, non-electric cables of metal