77017 INSTALLATION BRACE, FAN | The Saf-T-Brace allows you to safely install a ceiling fan or light fixture without access to attic space and provides secure attachment to an existing ceiling joist. Ideal for installation during new construction or remodeling, the mounting brace can also be installed in finished ceilings through a hole large enough to fit the box. Each end of the Saf-T-Brace includes four teeth for an extra-strong grip and screws into joists independently for added security and stability. For added ease, the electrical box can be positioned anywhere on the brace to fit your project needs. The heavy-duty, 1-1/2 in, all-metal electrical box, with 15-1/2 in wiring capacity has dual mounting capability for lightweight or heavier fans and fixtures. For fixture support up to 150 lb on 16 in centers and up to 50 lb on 24 in centers. It is acceptable for fan support up to 70 lb.