Ulti-Mate offers a super-fast, tool-free change between different diameters of holesaw, without adjustment of the drill chuck. Removal of cores from the holesaw after a cut is also much improved by the rapid release of the holesaw from the arbor. The A3-6 comprises: 1 x Ulti-Mate Holesaw Arbor with pilot drill. 1 x A3-3 Holesaw Adaptor suitable for Ø14-30mm (9/16 - 1.3/16in) holesaws. 1 x A3-4 Holesaw Adaptor suitable for Ø32-102mm (1.1/4 - 4in) holesaws.