Starrett Carbide Grit Hole Saws-Saw Diameter: 2 1/4" Carbide Grit Hole Saws-Saw Diameter: 2 1/4" Cut ceramics,glass resins,asbestos & other materials that would wear out conventional saws. They have a tough steel body with multiple carbide grits permanently bonded to the teeth. Very efficient at high speeds, they prevent binding action and cut smooth holes. The cutting depth is 1 5/8".