【High Quality Material】Carbide tipped alloy head material with stronger hardness. Carbide tipped drill bits are built for longevity and will stay sharper much longer than you're typical steel drill bit. 【With 7 Different Sizes】3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. 3-flats shank, these drill bits for glass perfectly fit various drilling tasks, high drilling accuracy. Rotating thread design, drilling and chip removal more smoothly. 【U Type Slot Design】 U type slot design with fast drilling dust remove, Triangular handle design, operation more stable. 【First-Class Performance】Spear pointed design, this strong tungsten carbide tip drill bit is sharp, easy to locate, drilling stably, fast speed, not breaking the border, opening neat, smooth. The 3-flats shank ensures you can hold it firmly, without slip and scratching, will not damage the tile glaze. 【Wide Range of Uses】Pointed design strong tungsten carbide tip can easily penetrate various material(porcelain ceramic tile, glass, mirrors,