1. Precise Tile Drilling: Achieve clean and accurate holes in ceramic tiles, porcelain, stoneware, glass, and more with our 4-piece diamond drill bit set.2. Versatile Sizes: This set includes diamond drill bits in 5mm, 6mm, 8mm, and 10mm diameters, providing you with a range of options for various drilling needs.3. Reliable Performance: Designed for heavy-duty use, these professional diamond drill bits are set with high-quality, temperature-resistant diamond grit for drilling through hard materials like granite and marble.4. Easy to Use: The hexagonal shaft with a 1/4" diameter fits most lightweight screwdrivers and hammer drills. The included practical storage box keeps your drill bits organized and protected.5. Efficient Cooling: Our diamond drill bits feature a coolant wax filling that reduces heat generation while drilling. For longer bit life, consider using water or another suitable coolant to maintain optimal performance.