The DEYI Extra – Large – Diameter Diamond Drill Bit Set exhibits an unrelenting performance. It applies vacuum brazing technology into these drill bits so that they can easily cut materials like porcelain and granite which are tough. Thanks to the diamond coating that increases the cutting efficiency as well as the cutting bits, which are inexpensive, it becomes feasible for professional and amateur alike. Thanks to the unwavering commitment to original ideas and quality assurance, Dometic has developed products that will sustain the brisk competition of the global market.