Hole Saw arbor supplied with 6.35mm (1/4?) pilot drill. Shank size 11mm (7/16?). Screw thread 5/8?-18. Screw thread 5/8?-18. Quick-Hitch arbors feature two locating pins inserted into the hole saw cap to prevent the hole saw overtightening on the screw thread. This allows easy and instant hole saw changes, without tools and without removing the arbor from the chuck. · · · For use with hole saws ranging from 32-210mm · · Permits instant change of hole saws without tools or removing the arbor from the chuck · · Arbor Shank Sizes: 11mm (7/16”) hex (excluding SDS-Plus arbors) · · Chuck Size: 9.5mm (3/8”) · · Drill: HSS · · Colour: Black and Grey · · Body Material: Steel · · Number of Parts: Three (Body, Pilot Drill and Screw)