Common metals and their alloys; metal building materials; internal and external door handles; knobs for doors and windows; metal corner-joints for making metal door frames; extruded aluminium connectors for door and window frames; junction plugs and dustproof seals for doors and windows; pulleys for sliding doors and windows; doors, gates, windows and window seals of metal; building materials of metal; cylindrical locks of metal; window seals of metal; hinges of metal for doors and windows; insect screens of metal; knobs of metal; metal locks; handles of metal for windows.