New box extender or spark guard, designed to close the gap on fire vulnerable material! 5 pack to 100 pack w/ volume discounts - unbeatable! Functions with all standard devices Switches, and GFCIs Works in handy boxes, plastic and 4 Inch square electrical boxes with plaster rings for single switches or receptacle Manufactured from 105 degree C continuous use 94VO rated flame retardant plastic for safer installations Great value, buy more! Levels and supports the wiring device where the box is set back from the wall surface (adjusts up to a 1-1/2 Inch box extension) Thank you for looking! We also have 2 gang and many other products!