Bar hangers and parts and fittings therefor made of metal for electrical fixtures/housing; Bolts of metal; Knobs of metal; Metal construction materials, namely, exhaust vent hoses for external ventilation of furnaces, heaters, stoves and boilers; Metal hardware, namely, double-end swivels; Metal hardware, namely, karabiners of metal; Metal pipe couplings and joints; Platforms, prefabricated, of metal; Steel balls; Steel grinding beads for use in wet milling