ONE good used screw on cover like shown. If you have lost or broken ones here are replacements, or use to create your own steampunk setup Metal (cast aluminum) Sorry we do not know the brand, as it is not marked. Look to be very similar to Hubbell or Stoneco, so possibly one of those? Threads on all brands may or may not be universal. See pict and compare to yours. Cage is approx 7" tall by 4.25 outer diameter at base (see picts) If you have mating fixture you can screw on. Or use ingenuity to secure over other bulbs such as two conduit clamps to clamp outer edge to ceiling over a lamp. Make some steampunk crafts NOTE (stuffed animal or light bulb in sample idea picts are NOT included) Pict is sample we have lots, ask if you need more than shown Most include the small allen set screw lock, but a few are missing. If you need that screw in place, Please Ask so we can check them and accommodate before shipping, otherwise they may or may not have the screw