Starrett A2 Arbor & High Speed Steel Pilot Drill Bit For 32-210mm Hole Saws The Starrett A2 Quick Hitch Arbor with 6.35mm (1/4\") high speed steel pilot drill and 11mm (7/16\") hex shank fits hole saw diameters from 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. Screw thread 5/8\" - 18. FEATURES Compatible with hole saws of diameters from 32 - 210mm Fitted with a 6.35mm (1/4\") high speed steel pilot drill and 11mm (7/16\") 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: A2 Diameter / Shank Size: 11mm PTA Shank Type: Hex Shank