The 1779804 Lenox Tools 5L Arbor fits Lenox Hole Saws from 9/16 inch to 1-3/16 inch, (Sizes 9L thru 19L). It features a Solid Hex Shank sized for use with 3/8” and larger drill chucks. The 5L Arbor includes a 1/4” pilot bit and will also work with most compatible brands of hole saws. The 5L Arbor is a screw-on style arbor and a hole saw is mounted simply by screwing it on tight to the arbor. The pilot bit is secured by a set screw and is easily removed and replaced, (part # 1779810), using an 1/8” Allen drive hex key, (hex key not included).