The Bosch High Speed Steel Router Bit is used for window and door cutouts in abrasive insulation materials, panelwood and paneling. The bit includes a drill-through pilot for guiding on a templet or for framing after the panel has been mounted. The concave grind offers a faster cut over the straight grind pilot panel bits. The shear angle on the bit provides improved cut quality and speed as well as long life. ADDITIONAL SPECIFICATIONS: Flute Length: 3/4"