FeaturesNo loose parts to misplace totally self-containedAllows fans/fixtures to be perfectly centered within roomLarge, 8 in square mounting surface handles newer fans with larger canopiesExpandable brackets hold box securely between joists no need to cut and nail 2 x 4 in to center the fan or fixtureInstalls quickly and securelyIncludes a template to level and position brackets between raftersTaller sides fit cathedral ceilings with angles greater than 80 degFan fixture installation screws are parked ready for easy fan fixture bracket installation70 lb fan and 200 lb fixture ratedAdjustable mounting bracketWithout knockouts