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Buycitky15 Pack Diamond Holesaw Drill Bit Set for Glass, Tile, Jewelry DIY 6mm-50mm Extractor Remover Tools Hole Saws Set Kit for Glass, Porcelain and Ceramic Tile 15 Pcses Diamond Coated drill Bit Size diameter included 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 40mm, 50mm. Durable Drill Bits with Good Performance Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. Excellent for making clean and accurate hole Widely Used in Different Occasion Drill Glass, Tile Bottles, Blocks Jars, Fiberglass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone. Some Tips Might Help You a. Can be used with a standard electric drill. b. Do Not for use on Concrete or for depths beyond about 1/2"""". c. Start your hole diagonally, make a round trace and then hold drill straight. d. Always use water for lubrication, otherwise the diamond core drill will burn. e. Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. Package list: 15Pcs * Diamond Coated Drill Bit Worry Free Warranty Money back guarantee and 12 months replacement warranty ensures customer satisfaction. If you encounter any questions, feel free to contact us!