METAL BUILDING MATERIALS, NAMELY, LATTICES, ROOF TRUSSES, GIRDERS, JOISTS, TRELLISES, BEAMS, RAILS, POSTS, LATCH BARS, BRAZING AND WELDING RODS, TUBING, AND CORNICES FOR TEMPORARY STRUCTURES, STAGE STRUCTURES, STAGE PLATFORMS, BACKDROPS, EXHIBITION STRUCTURES AND LIGHTING GANTRIES; METAL FASTENERS, NAMELY, BOLTS, HOOKS, NUTS, BRADS, CLAMPS, AND COTTER PINS; METAL PIPE FITTINGS AND COUPLINGS, NAMELY, SPIGOTS, COLLARS, ELBOWS, CONNECTORS, AND CLIPS; METAL WALL PANELS, CEILING PANELS AND FLOORIN...