Features: Effortlessly penetrate porcelain tiles with our upgraded Serrated edges Tile Drill Bit, doubling your drilling efficiency and precise. Featuring improved diamond grit coating and robusts brazing process, this drill bit ensures sharpness, long lasting cutting edge for over 300 holes with out chipping. Suitable for enthusiasts and professional contractors alike, this tool brings ease and proficiency to any tiling project. Whether you're working on ceramic, glass, marble, granites, or quartz, our drill bit is for smooth drilling in a variety of hard materials. Experience easy operate with the builts in cooling wax for dry drilling and a triangular handle that provide a secure grip on multiple drill models. Specifications: Component:Corundum Multiple Size as Picture Show; Option Diameter:Approx.25mm/0.98inch,30mm/1.18inch,35mm/1.38inch,40mm/1.57inch,45mm/1.77inch,50mm/1.97inch,55mm/2.17inch,60mm/2.36inch,20mm/0.79inch; Package Includes: 1pc Serrated Dry Drilling Hole Opener note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.