These Raised Panel Bits include a backcutter that routs a rabbet on the back of the door panel, resulting in a 3/4"-thick panel that sits flush with the doorframe for a professional, architecturally correct appearance. Shims are included to allow adjustment of tongue thickness from 7/32" to 1/4" for maximum versatility and compatibility. Exclusive Quadra-Cut™ design includes two cutters that shear upwards and two edges shearing downward to deliver a flawless finish. Use in table-mounted routers with fence only. Suitable for hardwood, softwood or composite panels.