Arlington's non-conductive box extenders extend set back metal or non-metallic electrical boxes up to 1-1/2 inches, the easy way! They work with any single gang device and most steel and non-metallic outlet boxes, and provide 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. Our newest box extender, the BE1X, has a slightly larger flange that provides extra device support when the wall opening is miscut or oversized. It accommodates midi or maxi cover plates and costs the same as our regular™ single gang BE1. If you normally use a midi plate this is the box extender for you.