Feature and Benefits: . 1/4" round shank. 1/2" - 20 thread. Standard pilot 49-56-8000. For hole saws 9/16 in. to 1-3/16 in. diameter This Milwaukee hole saw arbor has a 1/4 inch round shank and can be used in 1/4 inch capacity drills and larger. The arbor has a 1/2-20 thread and can be used on hole saws from 9/16 inch diameter through 1-3/16 inch diameter. It can be used with 49-56-8000, 49-56-8002 or 49-56-8005 pilot bits. Standard pilot bit 49-56-8000 is supplied with arbor 49-56-6950 for use on wood or metal. One arbor and pilot bit per package.