SMART BOX‚Ñ¢ SHARK TOOTH Cuts its own hole and mounts light fi xtures; smoke and carbon monoxide detectors. The built in hole saw creates the perfect sized hole every time. A piercing drill bit located at the center of the blade allows 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. Notes: Requires 9/16" driver (not included). Supports fixtures up to 6 lbs. 2-1/2" Deep. Volume 16.5 Cu In. Not for use on lath and plaster walls. Madison Electric is now part of the Southwire family. Product packaging may vary.