Drywall Mounting Bracket Box Extender Three or Four Gang X-Large, 10-packSome items may require minimum order quantities, which can be changed in your shopping cart. Description 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 flush with the wall surface. In steel boxes, they prevent arcing and shorting by creating a