Gratings, fences, railings for stairs, [ balconies, and walkways, ] gates, [ window shutters, window frames, ] [ fire safety doors, ] [ stair-cases, ] steps, namely, stair treads, nuts, bolts, and suspended ceiling systems comprising panels and framework, all of the foregoing made of metal

GRATINGS, FENCES, RAILINGS, GATES, [ WINDOW SHUTTERS, WINDOW FRAMES, FIRE SAFETY DOORS, STAIR-CASES, ] STEPS, NUTS AND BOLTS, SUSPENDED-CEILINGS ALL MADE OF METAL