Starrett A10 615-258 Arbor & High Speed Steel Pilot Drill Bit For 32-152mm Hole Saws The Starrett A10 Quick Hitch Arbor with 6.35mm (1/4\") high speed steel pilot drill and 8.75mm (11/32\") hex shank fits hole saw diameters 32 - 210mm (1.1/4\" - 8.9/32\"). A set screw in the body allows for easy replacement of the pilot drill. Quick Hitch arbors permit instant change of hole saws without tools or removing the arbor from the chuck.  FEATURES Compatible with hole saws of diameters from 32 - 152mm Fitted with a 6.35mm (1/4\") high speed steel pilot drill and 8.75mm (11/32\") hex shank Set screw in arbor body allows easy replacement of the pilot drill Quick Hitch arbors permit instant change of hole saws without tools or removing the arbor from the chuck SPECIFICATION Pack Quantity: x1 Pc Part No: A10 Diameter / Shank Size: 8.75mm PTA Shank Type: Hex Shank