Standard arbors are available for use with 1/4" and 3/8" chucks. 
Quick-Hitch arbors, available for 1/2" and 3/8" chucks, allow tool free hole saw changes. 
Heavy Duty locking arbors for 1/2" and 3/8" chucks are made for cutting larger sizes and/or difficult materials. Extended length arbors are also available. All are available with either HSS or carbide  pilot drills. 
The Oops arbor allows a hole cut with hole saw to be enlarged by attaching the original and larger hole saws to the special arbor. The smaller saw then is the pilot for the larger hole saw.