Irwin SPEEDBOR Spade Wood Drill Bit 1"X 4" (87916)

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, Manufacturer: AMEX9