【Various Diameters】In addition to 5, 6, 8, 10 and 12mm tile drill bits, you will receive a 6mm carbide drill bit. This saves you from having to drill with a diamond drill bit, allowing you to drill holes even more precisely and easily. 【Unique Dry Drilling Design】The wax inside for the cooling, our diamond tipped drill bits have built-in wax cores that automatically absorb and dissipate heat as you go. Dry drill bit has no water and less pollution. 【Multiple Uses】Porcelain drill bit ideal for drilling clean holes in hard materials including tile, porcelain, granite, ceramic, glass, mirror, stone and brick. Note: Not for wood, metal, plastic. 【Compatible Round Shanks】The glass drill bits are designed with a round shank, compatible with most machines, such as hand drills, grinders. angle and bench drills. Side flutes clear debris and drill holes smooth and fast; the depth mark is also useful for precise projects. 【High Quality Materials】Drill set with vacuum brazed diamond technology