2 gang, non-metallic adjust-a-box, with range knock out, allows installer to adjust box to any wall thickness, 34 cuin wiring capacity, used for dryers, ranges & other major appliances, comes preset at 1/2", adjusts from 0 to 1-3/4" after installation, simply clip included bracket onto any standard wood or metal stud, turning the screw adjusts box in or out to make it flush with any wall covering, patented design, ul listed.