Drywall Mounting Bracket Box Extender 1 - 4 GangDescription Drywall Mounting Bracket Box Extender Our Drywall Mounting Box Extenders set back metal or non metallic electrical boxes up to 1 1 2 inches. This product works with most steel and non metallic outlet boxes, providing a level, fully supported wiring device that's flush with the wall surface. In steel boxes, they prevent arcing and shorting by creating a barrier between the box and device screws. Features Features Allows the contractor to