Morse MA45PS (139038) 7/16in Hex Pin Arbor for 1. 1/4in-6in / 32-152mm Hole Saw The Morse MA45PS is for a 7/16 Inch Chuck and fits a Hole Saw range of 1. 1/4in-6in / 32-152mm. 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 3/8" or 1/2" drills 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: 7/16in Hole Saw Range: 1. 1/4in-6in / 32-152mm