The DeWALT® 7/16 in quick-change mandrel (1-1/4 to 6 in) is part of a full range of hole saw mandrels that was thoroughly tested through over 15000 cycles on a variety of jobsites to ensure that they work for you in real world situations. Hole saws will never lock to this mandrel because its spring-loaded collar automatically engages drive pins. Double set screws with a recessed combination head make centering bit changes quick and easy, so you never have to take your mind off the job. DeWALT® standard and quick-change mandrels are the right choice for any professional hole saw application.