This Saf-T-Box allows you to safely and securely install a ceiling fan or light fixture during new construction or in locations with attic access. This heavy-duty, 1-1/2 inch, all-metal electrical box, with 15.5 cubic inch wiring capacity is UL listed to support fans up to 70 pounds, and light fixtures up to 150 pounds. The Saf-T-Box includes a Saf-T-Cap to protect bolts and wires during drywall installation and painting.