Posi-Lock quarter-inch universal shank hole saw arbors feature positive lock, nonslip jaw slots that accept the jaws mechanism on power-drill chucks. These new Posi-Lock arbors fit quarter-, three-eighths and half-inch chucks and nine-sixteenth inch to 1 3/16-inch and 1 1/4-inch to 2-inch saw sizes. Posi-Locks come with pilot drills.

The M.K. Morse Co., P.O. Box 8677, Canton, OH 44711; (800) 733-3377; www.mkmorse.com.