IRWIN SPEEDBOR Drill Bit Set for Wood, 4-Inch, 6-Piece (1877239) Description The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills. From the Manufacturer The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout, and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills. Features: Three cutting spurs for faster, cleaner holes, less breakout and extended drilling life Full screw-point tip allows bit to self-feed for ease of drilling Shorter overall length for drilling in tight spaces. Ideal for holes up to 2" deep 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills Product Details: Shank Type: Hex Brand: IRWIN Item Dimensions LxWxH: 1.22 x 6.1 x 9.25 inches Minimum Bore Diameter: 4 Inches Point Style: Screw Point Shank Type: ‎Hex Brand: ‎IRWIN Item Dimensions LxWxH: ‎1.22 x 6.1 x 9.25 inches Minimum Bore Diameter: ‎4 Inches Point Style: ‎Screw Point Surface Recommendation: ‎Wood Manufacturer: ‎Speedbor Part Number: ‎1877239 Item Weight: ‎10.4 ounces Product Dimensions: ‎1.22 x 6.1 x 9.25 inches Country of Origin: ‎China Item model number: ‎1877239 Is Discontinued By Manufacturer: ‎No Size: ‎1-(Pack) Item Package Quantity: ‎1 Measurement System: ‎Inch Included Components: ‎(6) Speedbor Max Speed Bits sizes: 1/2" ,5/8", 3/4", 7/8", 1" and 1-1/8" Batteries Included?: ‎No Batteries Required?: ‎No Date First Available: July 7, 2014