Couplings and joints of metal for pipes; Door handles of metal; Door knobs of common metal; Furniture casters of metal; Metal expanding sleeves for affixing screws; Metal fittings for windows; Metal mounting brackets for general use; Metal nipples; Metal pipe couplings and joints; Metal pipes and metal fittings therefor; Metal screws; Metal spacer brackets; Nuts of metal; Rivets of metal; Screw rings of metal