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Package Includes: 6pcs 14mm Diamond hole saw, Diamond-coated hole saw, suitable for drilling holes in glass, marble, pocelain, fiberglass, slate, light stone, ceramic tiles or graniteRustless & Durable: This diamond drill bits are made of high strength Carbon Steel with smooth nickel plating surface to extend the service life.Quick, Sharp & Smooth Cut: Each diamond hole saw was coated with high quality Diamond to enhance the drilling speed and creates a sharp, high precision and smooth cut with no broken edges In Seconds. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.