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, #45950, diameter (D) 1/2, radius (r) 1/4, cutting height (B) 3/8, shank (D) 1/4, overall length (L) 2, type core box, replacement collar 47724, replacement bearing 47701, flutes 2, Carbide Tipped core box 1/4 radius x 1/2 dia x 3/8 x 1/4 inch shank with upper Bb