The Starrett A2E Arbor is suitable for use with holesaw sizes ranging from & Oslash32-210mm. It is fitted with a 6.5mm/1/4in pilot drill, with set screw in the arbor body allowing easy replacement of the pilot drill. This arbor features an extra-long pilot drill, suitable for use with the extended cutting depth of the Fast Cut Multi Purpose Holesaws. Shank Size 7/16in hex suitable to fit 1/2in capacity chuck.