Square Cover. Plaster Ring, Mud Ring | 4 11/16 in Square, 2 in Raised Single Device Tile Cover | 4 in Octagon Back Plate With 3/8 in Fixture Stud; (2) 1/2 and (2) 3/4 in Knockouts | Flexible and Easy to Use Device That Allows the User to Control Lutron Wireless Load-Control Devices From Anywhere in the Space. Battery-Operated Control Requires No External Power or Communication Wiring. Provides Control for Caseta Wireless Controls, EneFurbay Electric Supp