The Bosch HDG34 3/4-inch Pro Style Diamond Grit Hole Saw is one of the latest additions to the Bosch hole saw product line. The HDG34 features vacuum brazing technology for faster cutting and longer life than competitive products. As with Bosch's entire line of hole saws, these products are part of the patented Quick Change Universal Hole Saw system, which lets you change hole saws in seconds. Bosch's new Diamond Grit Hole Saws start fast and simple, every time.