No need to add water, you can drill downwards with just one click. Versatile different materials, efficient drilling. Main Features High-Quality Materials It is made of high-quality YG6X alloy as raw material. Oxynitriding process cutting head strengthen the hardness of the drill bit.SURFACE electrophoretic paint processFull grinding and anti-rust treatment, clean and sharp without burrs. The drill bit is more wear-resistant and more durable. Fully Automated Polishing: CNC polished is fully automated, each is unified.UNIQUE cross angle designSmall notch resistance, stable drilling, speed, no border breakage. Opening neat, smooth, no broken edges, no shaking phenomenon, easy chips.WIDE UsageProfessional glass and tile drill bits provide smooth and accurate drilling in ceramic tile, marble, thin iron, mirrors and glass. Be sure to add water or coolant when drilling. 5 Different SizesSuitable for different needs. It can be installed in general electric hand drill, bench drill. The drill clamp of the machine is 10mm and above. SpecificationsMaterialsCemented CarbideProduct Weight125GRutter Size3*70/4*70/5*76/6*77/8*80Package ContentsUniversal Drilling Tool 5NoteDue to manual measurement, please allow slight measurement deviations. Due to different display and lighting effects, the actual color of the item may be slightly different from the color displayed on the pictures.