Daredevil spade bits are designed for professional users seeking speed, ease of use and hole quality. A full cone threaded tip pulls the bit through the material with less effort and vibration than other spade bits. The contoured paddle delivers faster chip removal; hex shank with power groove reduces slippage. Up to 10X faster than conventional spade bits. Benefits 12 In. straight extension 1/4 In. hex shank Full-cone threaded tip Hex power groove reduces slippage Drills 2.4 times faster with 53% less force than leading competitor Technical Data Specifications Attributes Description 12\” extension Flute Length 3.0 Item # – Length 12.0\” Quantity 1 Shank Diameter 0.25 Includes (1) 12 In. Extension for Daredevil Spade Bits