INDOOR | 4 in Octagon Back Plate With 3/8 in Fixture Stud; (2) 1/2 and (2) 3/4 in Knockouts | 2.86 in Length X 0.87 in Width X 1.5 in Height, 3/8 in Dia Hole, for Emt | 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