Accurately and easily traces 2-inch x 3-inch metal or plastic old work box outlines on surfaces for proper installation in walls. Centers the box to match any existing. Integrated vertical and horizontal levels and center point location mark allow for quick and easy placement of the tracer. Constructed of durable plastic featuring a rubber backing for turning ease and pliability to surfaces when tracing. Works both vertically and horizontally with extreme accuracy. Use alone for metal boxes, or snap on the included plastic adapter for plastic boxes.