Fits Hole Saw 32 - 210mm (1.1/4" - 8.9/32")FIts Chucks up to 13mm (1/2") Shank Size 11mm (7/16") Screw Thread 5/8"-18The set screw in the body allows for easy replacement of the pilot drill. Quick-Hitch (QH) arbors permit instant change of hole saws without tools and without removing the arbor from the chuck.Arbor supplied with High Speed Steel Pilot Drill