Morse MA35PS (139021) 3/8in Hex Pin Arbor for 1. 1/4in-6in / 32-152mm Hole Saw The Morse MA35PS is for a 3/8 Inch Chuck and fits a Hole Saw range from 1. 1/4in-6in / 32-152mm. Durable, heavy-duty carbon steel arbors come complete with pilot drill. 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: 3/8in (9.5mm) Hole Saw Range: 1. 1/4in-6in / 32-152mm