13 CONSTRUCTION MATERIALS-NAMELY, PARTS, FASTENINGS AND FITTINGS FOR WINDOWS, WINDOW FRAMES, WINDOW UNITS, DOORS, DOOR UNITS, GARAGE DOORS AND DOORWAY FRAMES, DOOR OR WALL RACKS, STAIRCASES, DAYLIGHT CUPOLAS; AND FURNITURE HARDWARE, ACCESSORIES AND FASTENINGS MADE OF METAL AND/OR PLASTICS