Thetfords 3.125" Coax Cable TV Plate offers an impact and road salt-resistant construction that is both UV stable and a colorfast, fade-resistant black. It offers 1GHz of Coax transfer power. It is designed for use as a direct OEM replacement. Each plate includes an installation kit for easy, straightforward application. Cutout Dimension: 1" diameter. Outside Diameter: 3.125" diameter. Applications include emergency, healthcare, marine, outdoor activities, recreational vehicles, toddler training, trucking, and vans.