DeWALT DW1640 Drill Bit, 3 in Dia, Heavy-Duty, 7/16 in Dia Shank, Ball Groove Shank

With an aggressive spur for fast material penetration, DeWALT self-feed bits feature optimized cutting geometry for long-life and an open-tooth design for easy re-sharpening. A 7/16 in ball groove shank offers quick-change applications.