Yosoo 5 pcs Diamond Hole Saw Drill Bit Set 3/4" - 1 1/2" inch Granite Glass Tile 5 pieces Popular Sizes: - 3/4" (20mm) - 1" (25mm) - 1 1/4" (32mm) - 1 3/8" (35mm) - 1 1/2" (38mm) Diamond coated hole saw / drill bit. Can drill 1 1/2 inch deep. Suitable for use in drill hole on glass, marble, tile or granite. The shank is 3/8 inch thick. Start slowly, 45 degree angle. Go vertical after you make an initial mark. - Let the tool work it self - take your time. - Water as a coolant is a good idea.