6 Unwrought or partly-wrought common metals and their alloys; rolled and cast building materials of metal, namely, building trim, doors and windows, roofing, window shutters, roof trusses and flashings, joists, moldings, braces, shores, supports, awnings, composite panels, counter tops for further installation, drywall corner beads, soffits, fascia, ceiling and floor boards, canopies, stair nosing, and metal reinforcement materials for buildings; metallic materials, namely, railings, beams, pipes and tubes, poles, posts, chains, rivets, bolts, storage sheds, plugs, nails, screws, nuts, lids, boxes, nipples, knobs, hooks, hinges, ladders, stools, springs, pulleys, washers, gratings, gates, fences, grills, forgings, flanges, conduits, and bins; castings, namely, casting alloys, die castings of metal, metal casting; metallic molds for metal castings; ducts and pipes of metal for central heating installations