Tri-Flute design allows for faster chip ejection, making this woodboring bit the fastest Speedbor bit ever! Max Life cutting spurs have 3 cutting edges for added durability. Grooved hex shank prevents slipping in drill chuck or bit extension (fits all standard 1/4in. quick-change chucks). Max Ease full screw tip allows bit to self feed.Includes (qty.) 6 Chuck Size (in.) ¼