- Use to drill perfect holes for 1/4-20 Machine Screw Anchors in either concrete or CBS
- Smaller pilot bit starts the hole in the correct location then the larger 1/2" bit drill the perfect sized hole for the anchors
- Large diameter drill bit is 2-1/2" in Length - Overall drill bit is 3-1/2"
- Includes adjustable collar and hex allen wrench allowing you to set the depth of the hole
