HUBBELL WIRING Device-Kellems wall plates bring an unparalleled combination of features, benefits and advantages. They are elegant enough for the home and tough enough to withstand the most rigorous environments. Bryant nylon wallplates are designed for durability and easy cleaning. Standard sized wallplates are 1/8 in. larger to give you that extra coverage to hide rough box openings. The depth is 1/4 in. so that it will comfortably fit over the device even on imperfect installations or on retrofit work.