The Irwin SpeedBor Max self-feed bit bores large-diameter holes in wood for plumbing, conduit and electrical rough-in. A full screw point pulls the bit into the material so it feeds itself, and three cutting spurs shear the rim of the hole for a cleaner cut with less breakout on the back face.

• Full screw point self-feeds through the workpiece
• Three cutting spurs for faster, cleaner holes and less breakout
• Extended drilling life
• Grooved hex quick-change shank resists slipping in the chuck
• Works in impact drivers as well as standard drills
• Cutting diameter: 1-1/2"
• Overall length: 5"