The Lenox Tools 1779774 1L Arbor with Pilot Drill Bit ,4 1/4-Inch for Hole Saws 9/16-Inch by -1-3/16-Inch With Adjustable Pilot Bit is a durable, long lasting arbor that works with most hole saws. The 1L Arbor Simply allows you to screw the hole saw onto the arbor. The arbor also allows for you to replace the pilot bits through the use of a hex key and a set screw.