Key Features: The IMBA-BE1 (UL Listed) Value pack of 25, 1-gang electrical power outlet box extender, is a device designed to extend the depth of an electrical outlet box in situations where the electrical wiring and outlets are set too far back within a wall, such as when adding new outlets or replacing older electrical boxes. Single Gang Compatibility: Designed to fit 1-gang electrical outlet boxes. The extender increases the available space behind the outlet cover to accommodate thicker wiring, larger plugs, or bulky adapters. This ourlet box extender are automatically levels and supports outlets, switches, GFCIs, receptacles and other standard devices.