The Saf-T-Brace allows you to safely install your ceiling fan or lighting fixture in three easy steps--without having to access attic space. 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 ceiling fans up to 70 pounds. The Saf-T-Brace comes with everything you need for installation, including easy-to-follow instructions. The brace's three teeth easily twist and lock into the ceiling joists and its square tube allows for easy turning and adjustment. For added ease, the electrical box can be positioned anywhere on the brace to fit your project needs. It works with existing ceiling joists between 16 and 24 inches wide. The brace's 15-1/2 cubic-inch, 1-1/2 inch, dual-mount electrical box provides 8-32 threads for cover plates and lightweight lighting fixtures and 10-24 threads for ceiling fans and chandeliers. It also includes a Saf-T-Cap to protect bolts and wires during drywall installation and painting in a retail colored box. This brace is UL/CUL 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.