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., #45750, diameter (D) 1/2, angle (a°) 90°, cutting height (B) 1/2, shank (D) 1/4, overall length (L) 2, type V-Groove, replacement collar 47724, replacement bearing 47701, flutes 2, Carbide Tipped V-Groove 90 deg x 1/2 dia x 1/2 x 1/4 inch shank with upper Bb