The DEWALT® 3/8 In. quick change mandrel (1-1/4 In. to 3 In.) is part of a full range of hole saw mandrels that was thoroughly tested through over 15,000 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.