iMBAPrice BES1-1 1-Gang Non-Metallic Shallow Surface Box Extender adds 5/8-Inch in depth and 5.3 cubic inches in volume to the enclosure without removing the existing shallow box. It can be used with standard or mid-size wall plate and is constructed of durable plastic that can be painted to match any decor. It measures 3.336 Inch x 0.625 Inch x 5.117 Inch. The 1-Gang Box extender is fast, easy and convenient to operate that save time and money to operator. It allows you to install larger devices such as dimmer switches, GFCI's and speaker volume controls in shallow boxes. Box extender can be secured over the electrical box by using mounting screws and can be used for indoor as well as outdoor applications.