MAGBIT 701.0516 MAG701 5/16-Inch by 7-7/8-Inch Single Spur Auger Bit High grade steel 1045 carbon steel for a longer life Self feed tip has a single spur to leave a cleaner entry and exit hole Quick change 7/16-Inch hex shank for use in quick change chucks or standard chucks self feeding screw point for faster hole starts and easier cutting Machined on a center post for a stronger more rigid bit