Various DiametersIn 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 DesignThe 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 UsesPorcelain 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 ShanksThe 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 MaterialsDrill set with vacuum brazed diamond technology offers super high efficiency, cuts faster and lasts longer. 6pcs dry diamond drill bit set - 5, 6, 8, 10, 12mm and 6mm carbide drill bits. Ideal for drilling clean holes in hard materials. High quality, high temperature resistant diamond grit for efficient drilling. Filled with cooling wax, suitable for dry drilling. No cooling needed when drilling, as the drill bits are equipped with cooling wax inside. However, it can increase the service life of the drill bits. How to use? 1. Install the hole punch bit on the hand drill to use. 2. The electric drill keeps the speed high and tilts at 45 during the whole process to get the crescent groove. 3. After drilling the positioning groove, place the electric drill upright, slowly shake it in one direction, and drill. 4. Drilling completed. It is important to make a slight rotational movement when drilling! This ensures ideal drilling results. Note Prohibited materials: cement, metal, tempered glass, wood, plastic, etc. If using a cordless screwdriver, make sure the speed is above 1600 rpm. When using a hand drill, make sure the speed is above 2,000-3,000 rpm. Dry Diamond Bit Set 5/6/ 8/10/12mm 6mm carbide drill bits Drill depth: 35mm Length: 65mm