DW1810 offers tool-free quick-release collar to prevent hole saws from locking to the mandrel * DW1803 and DW1805 offer spring-loaded collar that automatically engages drive pins to prevent hole saws from locking to the mandrel * All quick change mandrels feature double set screws with a recessed combination head for quick and easy centering bit changes * All quick change mandrels utillize hardened steel construction and have been tested through 15,000 plus cycles to deliver jobsite durability * DEWALT offers a full range of standard and quick change mandrels for versatility in a wide range of hole saw applications.