Best 7Pcs 3mm-12mm Multifunctional Cross Alloy Triangle Hole Opener Drill Bit Metal Glass Tile Wood Punch Opener

 No need to add water, you can drill to the bottom in one click. Universal various materials, efficient drilling. Main Features ➊ HIGH-QUALITY MATERIALSIt is made of high-quality YG6X alloy as raw material. The process of oxynitride of the cutter head strengthens the drill hardness. ➋ 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: Polished CNC is fully automated, each one is unified. ➌ UNIQUE CROSS ANGLE DESIGNSmall incision resistance，feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. ➍ WIDE USAGEProfessional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plates, mirrors, and glass.  ➎ 5 DIFFERENT SIZESSuitable for your different needs. It Can be installed in the general electric hand drill, bench d