Bastex Diamond Grit Hole Saw Bit Drill Set (3pc). Includes 6mm, 8mm, 10mm bit Sizes, Made for Cutting Ceramic Tile Marble Glass Porcelain and Most Hard Surfaces. GENERAL USAGE: Diamond Hole Saw bits are versatile drill bits that allow you to cleanly cut glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone and fiberglass. Most importantly with diamond drill bits you greatly improve the accuracy of the hole than standard bits. *It is important to note that you must keep your drill bit wet as the friction of the bits and materials build up heat quickly.* QUALITY: Made from high strength carbon steel makes these drill bits durable and precise. Steel construction also makes for a longer lasting tools set. When you need to drill holes rest assured these bits will be ready. Nickel-plated with a diamond dust coating offers superior performance and cutting strength PRECISION: All the bits are processed for a smooth and exact finish. This type of production leads to a consistent product where every job is done fast, efficient and correct. Will work with all electric drills. Cuts clean, perfectly round holes to a depth of approximately 7/8 inches SIZES: Includes the following diameters, 6mm, 8mm, 10mm For use on wood, porcelain, glass, tile, ceramics, stone, masonry, granite and other hard surfaces. WARRANTY: We are proud of any product that bears our name so we include a 30 day money back guarantee with every item. If you don't like it for any reason, send it back. We also include a 1 year replacement warranty.