<P>Four (4) RJ Keystone Opening Knockouts. Use As Blank Plate or For Up to Four (4) RJ Openings. Note: For RFB4 Series Floor Box Side <BR />Compartment Only. Opening Dimension Is 9/16'' X 3/4'' ( 14.3MM X 19.1MM). For Use On Tile, Terrazzo, Carpet, or Wood Covered Floors. Additional Configurations Available. Please Consult Your Local Sales Representative For More Information.</P>