Morse MA24 (139007) 1/4in Hex Pin Arbor for 9/16in - 1. 3/16in / 14-30mm Hole Saw The Morse MA24 is for a 1/4 Inch Chuck and fits a Hole Saw range from 9/16in - 1. 3/16in / 14-30mm. Durable, heavy-duty carbon steel arbors come complete with pilot drills. Adapt Morse hole saws to any power drill used by professionals. Different Arbor Features: Various shank sizes for 1/4\", 3/8\" or 1/2\" chucks Short pilot drills and arbors require a 3-1/16\" pilot bit Long pilot drills and arbors have a pass through shank Hex arbors with non-slit jaw slots are positive drive SDS arbors are used in tools having SDS chucks, to drive hole saws in rotary hammers or hammer drills Specification: Chuck Size: 1/4in (6.3mm) Hole Saw Range: 9/16in - 1. 3/16in / 14-30mm