Starrett: A10 Arbor to suit 32-210mm Holesaws STRA10 A10 Arbor to suit 32-210mm Holesaws. Fitted with a 6.5mm/1/4 in pilot drill, with a quick hitch mechanism that enables the user to instantly change holesaws without the use of tools and without removing the arbor from the chuck. Suffix E denotes extra-long pilot drill. Shank Size 8.75mm hex suitable to fit a 9.5mm capacity chuck. A10 Arbor to suit 32-210mm Holesaws. Fitted with a 6.5mm/1/4 in pilot drill, with a quick hitch mechanism that enables the user to instantly change holesaws without the use of tools and without removing the arbor from the chuck. Suffix E denotes extra-long pilot drill. Shank Size 8.75mm hex suitable to fit a 9.5mm capacity chuck. This Sterrett A10 Arbor, to suit 32-210mm diameter Holesaws. Fitted with a 6.5mm/1/4 in pilot drill, with a quick hitch mechanism enabling the user to instantly change holesaws without the use of tools, and the removal of the arbor from the chuck. Suffix E denotes extra-long pilot