9PCS , Diamond Core Drill Bits Set Diamond Tipped Drill Bit for Fast Dry Drilling, Glass Drill Bit Size 1/4" 5/16" 3/8" 1/2" with Storage Case/ 1/4 Inch Hex Shank - Anglekai Dry Diamond Drill Bits Set

• 【9PCS Drill Bit】: You will receive 9 pieces of dry diamond drill bits set, 2 pieces of 1/4 inch (6 mm), 2 pieces of 5/16 inch (8 mm), 2 pieces of 3/8 inch (10 mm), 1 piece of 1/2 inch (12 mm), 2 black hexagonal straight diamonds 【Fast Drilling】: Diamond drill bit has a built-in wax lubricant that melts and then cools the cutting surface, acting as additional coolant to extend the life of the drill bit. The side groove shape of the surface clears debris quickly and faster cutting 【Precise Drilling】: The 1/4 inch hex shank provides precise positioning for diamond tipped drill bits. Use them to drill holes to get a professional finish, suitable for tiles, porcelain, ceramics, granite, and marble 【Heavy-duty】: Diamond core drill bits set are made of high-quality metal and vacuum brazing technology, to make the diamond particles tightly adhere to the core steel. They are resistant to high temperatures, friction, and not easy to break 【Clear Scale】: The depth is marked on each tile drill bit with clearly words, providing guidance for precise hole depth. Comes with a box for easy storage and carry out, fit for electric drills and angle grinders (an angle grinder needs to be installed)