Hi Carl The normal size of an arbor for that size holesaw will fit a 1/2 inch chuck, In most cases the saw would screw onto the arbor, and be secured by two pins. The shank being 1/2 inch hexagon, although there are 5/8 versions.So the question is, what size is your drill chuck, and what size is the arbor ? I do have to say that if your drill is a cordless version, I doubt that it would have the power to cope with a 102mm holesaw, You need a lot of torque, even in plasterboard.
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