Duraflo 642145-00 Three Wave Light Mount, White Use siding blocks to provide a neat, level, weatherproof surface for installing exterior lights, dryer vents and more Scalloped Series By simply reversing the trim ring, the fixture will accommodate 1/2" to 1-2/8" Siding WeatherPro Series By simply reversing the trim ring, the fixturewill accommodate 5/8" to 1-1/4" Siding