Bosch 1/2 In. Diamond Hole Saw fast and easy starts, even when working with the hardest materials such as porcelain and granite. Designed with the Quick Change™ universal hole saw system, it allows you to switch to any size or type of hole saw in seconds, making your work more efficient and convenient. This hole saw is intended for use only with machines designed for wet sawing and must be operated on a GFCI-protected circuit to ensure safety and optimal performance. Model Number: