Product Description Arlington BE1-5 Electrical Outlet Box Extender, 1-Gang, White, 5-Pack. Used for extending set back electrical boxes up to 1-1/2-inches, levels and supports wiring device. Automatically levels and supports outlets, switches, GFCIs, and other standard devices. Also used for handy boxes and 4-inch square electrical boxes with plaster rings for single switches or receptacles. Manufactured from 94VO rated flame retardant plastic for safer installations, two hour fire rating. Compliant with 2008 NEC Article 314.2. To install without removing device wires, pull wires through box, tilt the device through the unit at a slight angle and push firmly into electrical box, attach wires to receptacle, straighten it and tighten the screws. UL and CSA Listed, industry standards for safety and quality. Made In USA. From the Manufacturer Arlington BE1-5 Single Gang Box Extender, 5-pack. Use Arlington's UL and CSA listed, non-conductive Box Extenders, BE1-5, to extend set back electrical boxes up to 1-1/2-Inch. Level and support wiring devices to bring flush with wall surface, trimmable. 5 per package