Copper has become hugely popular in home interiors in recent years. This versatile colour complements many decor styles. With a subtle brushed finish to reduce reflection and fingerprints, this Brushed Copper Double Blank Plates from Lieber offers quality and style at a competitive price. What is a blanking plate?Blanking plates (or blank plates)are used to cover unused back boxes. If you have a removed switch, and it's no longer needed, you can use a blanking plate to cover the space.