Porcelain Tile Diamond Drill Bits Dry Hole Saw Set for Ceramic Marble Granite Stone,Diamond Core Bit Kit Quick Change Shank Fixed on Drills,No.K7

【Package Includes】4 pieces dry diamond drill bits: 3pcs 6mm, 1pc 8mm; and 1pc 6mm Carbide Drill Bit Quick Change Shank 【Wax Inserted】Each dry diamond bit is embedded with wax that will melt during dry drilling to cool the cutting surface; Water can act as additional cooling to prolong the worklife of bit. 【Upgraded Design】High-quality diamond particles contribute to high efficiency and faster drilling speed; Design of spiral groove at the top of bit helps remove debris. 【Multiple Application】Dry drilling for Granite, Tile, Ceramic, Marble, Stone, Glass, Porcelain, Masonry, etc.6mm carbide drill for pre-drilling precise holes 【Wide Compatibility】They can be used with hand drills, angle grinders, bench drills and most other machines. Notice: If using Hammer Drill,please shut off Hammer Mode,Recommended 2000-5000RPM,MAX RPM 5000