Ceiling box featuring a built-in hole saw that cuts the perfect sized hole every time. Includes a piercing drill bit located at the center of the blade to allow for location accuracy during installation. Raised mounting rings with center hole are located inside the back wall of the box for surface mount installations, basement, or attic studs. Ideal for mounting light fixtures and smoke & carbon monoxide detectors. Requires 9/16-inch driver, not included. Supports fixtures up to 6 pounds, 2-1/2 inches deep. Not for use on lath and plaster walls.