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WebFind many great new & used options and get the best deals for 10 Pcs 6mm Diamond Coated Drill Bit Tile Ceramic Glass Hole Saws Hole Opener at the best online prices at eBay! Free shipping for many products! WebJun 3, 2008 · Diamond Core Drill Bits are premium specialty drill bits designed for drilling in hard abrasive non-ferrous materials. The electroplate bonded diamond drill bits have a superior design developed through extensive testing. Water is required for lubrication when drilling. Designed for drilling to depths of about ½”. WebDiamond core drills are available in sizes 1mm - 3mm and 3.5mm - 60mm and larger. For drilling tiny holes in plates, glass, fused glass and for thin pieces of sea glass we recommend using a small diamond core drill. … dwp better off calculator