Sometimes there is a need for a non-round hole to slightly enlarge a hole, or cut a short slot. This is where the Drill Saw Rasp comes into its own. The initial portion looks like a normal twist drill, this is followed by a spiral rasp, allowing the Drill Saw Rasp to first drill a hole then be moved sideways in whatever direction is required. TiN coated for extra long life. This small handy box set covers: 3, 4, 5, 6, 6.5 and 8mm. Use in wood, plastics, aluminium etc.