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Product Description With a tool-free, quick-release collar to prevent locking, DEWALT Quick Change Hole Saw Mandrels feature double-set screws with a recessed combination head for quick, easy centering bit changes. Tested through 15,000+ cycles to ensure extreme jobsite durability, each DEWALT hole saw features the patented DEWALT Pilot Point Tip for fast material penetration. Amazon.com DEWALT's Heavy-Duty 3/8-Inch Shank Quick Change Mandrel features a spring-loaded collar that automatically engages drive pins, a patented Pilot Point tip that allows for faster penetration of materials, and double-set screws with a recessed combination head making it easy to quickly change centering bits.