Irwin 3041001 Speedbor Max 1/2-Inch by 6-Inch Self Feeding Spade Bit IRWIN SPEEDBOR drill bits use a tri-flute design for faster chip ejection and less binding This 1/2-inch drill bit has cutting spurs with 3 cutting edges for faster, cleaner holes A full screw tip allows the drill bit to self-feed for ease of drilling The grooved hex shank helps prevent slipping in the drill chuck or bit extension Fits virtually any standard 1/4-inch quick-change chucks, including impact drills A fast speedbor spade bit that features a Tri-Flute design with a fast chip ejection Cutting spurs have 3 cutting edges Grooved hex shank prevents slipping Fits all standard 1/4-inch quick change chucks Full screw tip allows the bit to self feed