Greenlee 38522 Hole Saw Arbor, 5/16-Inch Hex Shank for 9/16-Inch to 1-3/16-Inch Hole Saws The best arbor in the industry ensures a solid connection without any gaps or wobbling Arbors include replaceable, high-speed steel pilot drill Pilot drills have unique split-point tip design Use with Greenlee bimetal hole saws, recessed light hole saws and carbide-grit hole saws Can be used with Greenlee 901 or 904 bit extensions