Coolnut 10Pcs 5mm Dry Diamond Drill Bits Set, 3/16 Diamond Core Drill Bits for Tile Ceramic Porcelain Stone Glass(not for Wood)

【Diamond Drill Bit Set】Includes 10 dry diamond drill bits for 3/16 inch (5mm) holes. Enhanced with cooling wax for heat resistance and drilling efficiency. 【Cooling Wax Feature】Diamond drill bits with built-in wax lubricant that melts during dry drilling to cool the surface, allowing for prolonged use on large projects. 【Dry Drilling Efficiency】Integrated wax lubricant in diamond drill bits cools the cutting surface during dry drilling; water can be added for additional cooling to prolong bit life. 【Versatile Material Use】Diamond drill bits made from C45 tool steel for robustness, suitable for porcelain, ceramic, stone, masonry, and concrete tiles. (Wood not recommended). 【 Machines】Fits most devices hand drills and angle grinders. Suitable for wet or dry use; water cooling advised for extended durability. Adjust speed to 800-1000RPM for glass drilling.