[ALUMINUM, ]ALUMINUM EXTRUSIONS, ALUMINUM SHEETS,[ AND ALUMINUM ALLOYS SOLD IN BULK; COMMON METALS, THEIR ALLOYS AND SHEETS OF COMMON METALS SOLD IN BULK;] BUILDING MATERIALS MADE OF COMMON METALS AND ALLOYS THEREOF, NAMELY, PREFABRICATED SECTIONAL METAL BUILDINGS, DOORS, FRAMES, WINDOWS, PANEL SUPPORTS, STRIPS, RODS, AND WIRES;[ ARTICLES OF COMMON METALS, NAMELY, CAST IRON, FORGED IRON, CAST ZINC ALLOY, CAST ALUMINUM ALLOY, CAST BRAS AND CAST BRONZE IN THE NATURE OF FITTINGS AND FIXTURES OF METAL FOR CUPBOARDS, DOORS, WINDOWS, NAMELY, METAL NAILS, METAL SCREWS, METAL BOLTS, DOOR KNOBS AND WINDOW KNOBS, DOOR HANDLES OF METAL, CHAINS, SECURITY CHAINS, SLIDE RAILS FOR DOOR AND WINDOWS, SNAP CATCHES FOR CABINET DOORS, RETAINER RINGS, METAL HOOKS, METAL CHAINS, METAL SPRINGS, AND SLIDE RAILS FOR DRAWERS; IRON WIRE FENCES; GENERAL PURPOSE METAL STORAGE UNITS; ]AND METAL LADDERS AND STEP LADDERS