Snap Back Arbor with 4 1/4-Inch Pilot Drill Bit for Hole Saws 1-1/4-Inch - 6-Inch is a durable, long lasting arbor that works with most hole saws. The 2L Snap Back Arbor Simply allows you to pull back the drive pins and screw the hole saw down. Once you release the drive pins, they will snap in to place allowing the hole saw to turn on the pins and not the threading. This allows you to release the hole saw a lot easier after you have drilled your hole, saving time and frustration. The arbor also allows for you to replace the pilot bits through the use of a hex key and a set screw.