This Westinghouse Lighting Saf-T-Box allows you to safely install a fan or lighting fixture during new construction or in locations with attic access. Featuring a heavy-duty, all-metal, 15-1/2-cubic-inch, dual-mount electrical box, the Saf-T-Box works with any model of ceiling fan. The box supports fans up to 70 pounds and lighting fixtures up to 150 pounds. The box comes with a Saf-T-Cap to protect bolts and wires during drywall installation and painting and everything you need for installation. It includes 10-24 threads for fans and chandeliers and 8-32 threads for cover plates and lightweight lighting fixtures.