IRWIN SPEEDBOR Spade Wood Drill Bit, 5/16" (88805)

Patented Blue Groove parabolic scoop for faster chip removal Designed for impact drivers with 1/4" impact rated shank Blue-Groove drill bit point and cutting edge for fast chip removal Wood drill bit uses double-cutting spurs that scribe the outside of the hole, reducing breakout Flat drill bit features a large shank for added durability