Diablo DAG3030 Auger Bit, 1/2 Inch x 17-1/2 InchThe self feeding dura tip pulls the bit while the dual cutting edge delivers an effortless, smooth drilling experience in wood with nails. Deep flutes enhance the chip evacuation process for more holes per charge. Highlights: Size : 1 2 Inch x 17 1 2 Inch Diablo's auger bit range provides maximum performance, extreme durability and superior life in nail embedded wood applications The self feeding dura tip pulls the bit while the dual cutting edge