This Milwaukee Hole Saw Arbor has a 7/16 inch hex shank for greater gripping capability in the chuck. It can be used in 1/2 inch capacity drills and larger. The arbor has a 1/2-20 thread and can be used on hole saws from 9/16 inch through 1-3/16 inch. It can be used with 49-56-8000, 49-56-8002 and 49-56-8005 pilot bits. Pilot Bit 49-56-8000 is supplied with this Arbor for use on wood and metal. One arbor and pilot per package