MAGBIT 704.0516 MAG704 5/16-Inch by 13-Inch Single Spur Auger Bit High grade steel 1045 carbon steel for a longer life Use when a 6-Inch bit is too short and 18-Inch is too long for the 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