Product Description: BE4-10 Outlet Box Extender, Made in USA. allows the contractor to comply with 2008 neck article 314.2. Works in handy boxes and 4-Inch square electrical boxes with plaster rings for single switches or receptacle. Levels and supports wiring device where box is set back from wall surface, adjusts up to 1-1/2-Inch box extension. Works with all standard devices switches, and gfcis, manufactured from 105°c continuous use 94v0 rated flame retardant plastic.