DEWALT DW1801 3/8-Inch Mandrel, 9/16-Inch To 1-3/16-Inch 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.