Octagonal shapes are very popular for kitchen corner cabinets, entertainment centers, kitchen islands and corner hutches, but the joints used to be difficult to cut and a nightmare to clamp. Now this 2-piece bit set provides a fast, accurate way to build a strong, tight 45 joint. Better still, the lock miter design makes it easy to clamp This matched pair of cutters makes set-up easy. Height adjustment is not critical - simply adjust your fence so the top edge of the work piece intersects the angle of the bit where it meets the fence. After your joints are machined they can be glued and assembled and simply clamped by using strapping tape.