Eagle Tool EA56272 Flex Shank Installer Drill Bit, Auger Style, 9/16-Inch by 72-Inch, Made in the USA Aggressive and self feeding auger point Flexible spring steel shank with wire fishing accommodation holes in the head and shank. Three flat non-slip grip on the chuck end Add a Quick Switch Hex to adapt to a Quick Change chuck part number ETHXKIT187 Made in USA