Hole Saw Arbor, Manufacturer suggested retail price. $18.20 Features and Benefits: This Milwaukee Hole Saw Arbor has a 7/16 inch hex shank for greater gripping capability in the chuck. The backing plate is equipped with spring loaded snap pins which lock into holes on the backing plate of the hole saw for positive efficient transmission of torque. It can be used in 1/2 inch capacity drills and larger. The arbor has a 5/8-18 thread and can be used on hole saws from 1-1/4 inch and larger. 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. Manufacturer: Milwaukee Electric Tools 5 yr warranty on material and workmanship