Bolt snaps of metal; Buckles of common metal; Door fasteners of metal; Door fittings of metal; Door handles of metal; Door knobs of common metal; Knobs of metal; Metal clasps for door security hardware; Metal knobs; Metal self-aligning demountable snap fasteners consisting of press fasteners and press studs for use in attaching panels, hatches, floors and furniture in boats, motor vehicles, trains, aircraft and buildings