Upgrade your drilling game with the 5-Pack 5/16" Dry Diamond Drill Bits Set – the perfect solution for precise and fast dry drilling of ceramic, porcelain, marble, granite, stone, glass, and brick tiles. Features: This set of 5 diamond core drill bits features a 5/16 inch (8mm) diameter and a round shank for easy, secure attachment to your drill. With these drill bits, you can renovate or upgrade your kitchen or bathroom with ease. The high technology diamond coating used in this set ensures that the bits can penetrate even the hardest materials without cracking them. Plus, the bits integrate wax lubricant inside to minimize heat build-up and improve overall performance. Compatibility: These diamond drill bits are compatible with a wide range of materials, including tiles, porcelain, granite, ceramic, glass, marble, stone, and masonry brick (not for wood). The set comes with a convenient storage case to keep your drill bits organized and protected. User Tips: To use these drill bits, start at a 45-degree angle to the surface Slowly bring the drill to an upright position while moving in a circular motion. Do not apply too much pressure; let the drill bit do the work. Additionally, be sure to cool the bit if using it for multiple holes.