Features and Benefits:?Clean holes: Double wing spurs permit cleaner hole cutting?Efficient: Up to 10X faster drilling than flat boring bits?Fast chip removal: Nonstick, polished and coated flutes eliminate costly cleaning time?Versatile: 1/4" Power Groove Shank fits all 1/4" extensionsSPEED FEED self-feeding wood bits are made for drilling fast holes in clean wood. The double wing spurs cut clean holes for feeding wire or bolts through, and the feed screw and dual cutting edges provide up to 10 times faster drilling vs. flat boring bits.