Irwin 88805 IRWIN SPEEDBOR Standard-Length Spade Drill Bit, 5/16-Inch x 6-Inch length (88805)

Speedbor® Blue-Groove™ Standard Length Woodboring Spade Bit - 5/16" x 6". 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. Diameter: 5/16". Shank Size: 1/4" Quick-Change. Length: 6".