1 piece professional quality vacuum brazed diamond drill bits Diameter: 30mm; Total length: 60mm; Diamond height 10 mm; M14 thread Dry or wet drilling for porcelain tile ceramic granite marble stone Vacuum brazed technology offers a much longer lifespan than electroplated ones Less chipping; Minimize breakage; Less heat generation; Best finishing quality PRODUCT NAME: Professional Grade Vacuum Brazed Drill Bit Crowns M14 Thread Diameter 30MM QUANTITY: 1pc SPECIFICATION: Diameter 30 mm, total length 60 mm, diamond height 10 mm, M14 thread (very important for fixing on your machine) FEATURE: Dry or wet drilling p> Wide application for drilling ceramic tile, marble stone, granite... Vacuum brazing technology provides much longer life than electroplated ones (usually 3 -5 times) Less chipping, reduced breakage, reduced heat generation, better finish quality High rate of diamond exposure allows drilling faster and more aggressive. Save your money and time... Attention: The price of our product only includes product value and shipping cost if shipping cost is free, not including custom tax/tariff. We are a professional diamond tool manufacturer and supplier in China, we could supply you the following products used on granite marble concrete glass, ceramic and steel tile... Diamond Discs/Diamond Saw Blades < p>Diamond polishing pads diamond grinding wheel Diamond drilling bits Other accessories for diamond tools (router bits, engraving bits, holders, ....) The color red