Made in USA * allows the contractor to comply with 2008 nec article 314.2 * Works in handy boxes and 4Inch 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