The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR. The Speed Tip a cram full screw-point that allows bit to self-feed, as well as three -LRB- 3 -RRB- cutting spurs for faster, cleaner holes, less breakout and extended drilling life. The tapering tri-flute design for faster chip ejection and less binding. Its well-grooved hex shank slipping and fits all standard 1/4 '' changeable chucks, including impact drills.