The Westinghouse Lighting Saf-T-Brace allows you to safely install your ceiling fan or lighting fixture--without attic access. Ideal for installation during new construction or remodeling, the mounting brace can be installed in finished ceilings through a 4-inch hole. This brace is compatible with all ceiling fans. The brace's threaded multiple lead adjusts quickly, and its three teeth easily twist and lock into the ceiling joists. For added ease, the electrical box can be positioned anywhere on the brace to fit your project needs. It includes a Saf-T-Cap to protect bolts and wires during drywall installation and painting. It works with existing ceiling joists between 16 and 24 in wide. The brace is UL listed to support light fixtures up to 150 pounds on 16-inch centers and 50 pounds on 24-inch centers. It supports fans up to 70 pounds. The grid's electrical box provides 8-32 threads for cover plates and lightweight lighting fixtures and 10-24 threads for ceiling fans and chandeliers.