Irwin SPEEDBOR Spade Wood Drill Bit 1 1/2" X 4" (87924)

drills holes 2x faster. more holes. less time lasts 2x longer to get more done chamfered cutting edges for increased durability patented blue groove parabolic scoop for faster chip removal "designed for impact drivers with 1/4" impact rated shank", Weight: 6.25E-4 pounds, Manufacturer: IRWIN