Introducing the 'Starrett A10 Arbor 9mm Shank', optimally designed for use with 32mm - 210mm Hole Saws. This Quick Hitch Arbor features a high-speed steel pilot drill size of 6.35mm (1/4") and a hex shank diameter of 8.75mm (11/32"). It's specifically tailored to fit hole saw diameters ranging from 32 - 210mm (1.1/4" - 8.9/32"). The unique aspect of our arbor is its clever set screw construct within the body, which aids in the hassle-free replacement of the pilot drill. With Quick Hitch Arbors like Starrett A10, you can facilitate an immediate change of hole saws without needing additional tools or the necessity to detach the arbor from the chuck. Its design and features contribute towards enhancing the efficiency of your work, saving your precious time.