Alden 4017P 4-Piece Power Extractor Set

Drill-out is a drill-bit and extractor in one tool. It drills into broken bolts on center and extracts them cleanly using the power of the drill. The secret is in the serrated extracting end of the tool which drills down and wedges itself into the bolt resulting in greater torque for hard to remove bolts. Simply chuck the self-centering bit set your drill to reverse and drill at medium speed to extract the bolt.