Designed for fluting and 'V' grooving cuts guided by a template or pattern. The shank-mounted ball-bearing pilot rides along the template edge, and the cutter duplicates the template contour in the workpiece. With a handheld router, the template must be on top of the workpiece. With a table-mounted router, the template must be on bottom of the workpiece. 90° ‘V’ Groove bit is for decorative purposes and is not intended for ‘miter-folding’, etc.