Irwin Speedbor Standard Length Flat Wood Boring Bit Spade Bit 5/16 in Pack of 7

* Blue-Groove point and cutting edge for faster chip removal - 4x faster than standard spade bits.* Double cutting spurs scribe the outside of the hole reducing breakout. 10% larger shank for added durability.* Grooved hex shank prevents slipping in drill chuck or bit extension. Fits all standard quick change chucks.