Power change adaptor to fit the Bosch holesaw range. The hex shank fits a standard chuck, one arbor fits all sizes. Supplied with a HSS-G pilot drill for wood, metal and plastics. The holesaws simply click into the arbor, changing from one size to another can almost be done in a fraction of a second. No more holesaws jammed or seized on the arbor. SDS+ fitting and holesaws available separately.