Packed with the hole saws plumbers need in a durable case, the DEWALT 9 PC. PLUMBER’S HOLE SAW SET delivers strength and performance with a variety of deep-cut hole saws that cut twice the material in just one pass. An innovative plug ejection system enables fast plug removal. Thick, hardened backing plates helps to prevent thread stripping. An helps to increased high-speed steel height helps to increase durability.