No need to add water, you can drill to the bottom in one click. Universal various materials, efficient drilling. MAIN FEATURES HIGH-QUALITY MATERIALS It is made of high quality YG6X alloy as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness. SURFACE ELECTROPHORETIC PAINT PROCESS Full-grinding and anti-rust treatment, clean and sharp without burrs .The drill bit is more wear-resistant and more durable .Fully automated polishing: Polished CNC is fully automated, each one is unified. UNIQUE CROSS ANGLE DESIGN Small incision resistance，feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. WIDE USAGE Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, mirrors and glass. Remember to add Water or coolant when drilling. 5 DIFFERENT SIZES Suitable for your different needs.It Can be installed in the general electric hand drill, bench drill. The machine drill clamp range is 10mm and above. SPECIFICATIONS MATERIALS Cemented Carbide PRODUCT WEIGHT 125G PRODUCT SIZE 3*73/4*74/5*75/6*76/8*78mm PACKAGE CONTENTS Universal Drilling Tool × 5 NOTE Due to manual measurements, please allow slight measurement deviations. Due to the different display and lighting effects, the actual color of the item may be slightly different from the color displayed in the picture.