Installation stepslnstallation steps: 1. Use an 8 mm drill bit to drill 4 holes. 2. Use a 12mm drill bit to clear these holes. 3. Loosen the nuts of the expansion screws and install the expansion screws on the hooks of the ceiling. Insert the screws into the holes and secure them with a hammer. 4. Tighten the four screws to secure them firmly to the ceiling, and finally shake the ceiling hooks to make sure they aresecure.