Diablo DAG1900-S3 Auger Bit Set, 3 PieceThe 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 : 5 8 inch x 7 1 2 inch , 3 4 inch x 7 1 2 inch and 1 inch x 7 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