10 Sizes(Diameter): 6mm(1/4"), 8mm(5/16"), 10mm(3/8"), 12mm(1/2"), 15mm(3/5"), 16mm(5/8"), 18mm(11/16"), 20mm(3/4"), 22mm(7/8"), 30mm(1-1/5"). Meet most of your different needs. Stainless & Durable: Made of high strength carbon steel with smooth nickel plated surface to extend service life. Fast, accurate & Smooth Cutting: Coated with high quality diamond to improve drilling speed and creates a clean, high precision and smooth cut without broken edges in seconds. Application: Drilling Glass, Tile Bottles, Block Jars, Fiberglass Porcelain Tile Ceramic, Mable Slate, Light Granite Stone. Do not use on concrete or for depths greater than about 1/2"". Attention: Please keep the speed at 800-1000 per minute, keep adding water to keep the drill cool, strictly prohibit dry drilling. Product Description Diamond Drill Bit Set, 10 PCS Glass Hole Saw for Tile Glass Ceramic Marble Bottles DIY, 6mm -- 30mm Features: Good Performance: Diamond dust coating provides superior cutting performance and