common metals and their alloys; building materials of metal; window screens of metal; door fittings of metal; door frames of metal; metal window frames; fittings of metal for windows; metal window surrounds; security barriers of metal; building panels of metal; metal gratings; wire mesh; doors and windows of metal; screen doors of metal; grilles of metal

non-metal sliding doors; glass doors; doors of wood; screen doors, not of metal; doors, not of metal; non-metal windows; non-metal window frames; non-metal window screens; non-metal window shutters; non-metallic building materials