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This diamond coated core drill bit removes a complete circle from glass, marble, tiles,granite, ceramic or other.They are perfect for drill glass, tile bottles,blocks jars, fiberglass porcelain tile ceramic, slate Mable, granite light stone These bits are made of high-speed steel that is durable and have a long sevice life,which are high quality and good performance that excellent for making clean and accurate hole. The diamond hole saw creates a high precision, smooth cut with no broken edges. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerablySizes: 6mm/0.23″, 8mm/0.31″, 10mm/0.39″, 12mm/0.47″, 14mm/0.55″, 16mm/0.62″, 18mm/0.7″, 22mm/0.86″, 26mm/1.02″, 32mm/1.26″