This diamond brazed core drill bit set can greatly improve you working efficiency, with fast cutting speed, and the holes are round, neat and free of burrs. The blade is sharping, large opening with small resistance, which is fine for chip removal. Support for both dry use and adding water for lubrication use. Wide applications, which can be used to open holes on the glass, tiles, marble, granite, ceramic, and other materials. You can have a try. Features: The drill bits are made of quality diamond material, wear resistance and can provide long service time. New brazing processing, brazing with 40 mesh plump diamond particles, no deformation, no cracking and safer to use. Fast cutting speed, the holes are round, neat and free of burrs, which can meet your various work needs and enhance your productivity. Support for both dry use and adding water for lubrication use. When water needs to be added for long-term work, the temperature of the drill bit is prevented from being too high, the drill bit is protected, and the service time of the drill bit can be extended. Low noise, less dust, minimal debris, and no need for frequent blade replacement, saving work time and improve production and processing efficiency. Some models are designed with chip discharge holes design, smooth chip discharge and fast heat dissipation. Anti-slip handle design, which makes it can be used with hand drill and table drill. Wide applications, suitable for glass, glass tile, ceramic tile, cement tile, marble, granite, microcrystalline stone, etc. Two types optional, you can choose 12pcs plastics box set or 10pcs wooden box set depending on your needs. 12pcs plastics box set: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 35mm. 10pcs wooden box set: 6mm, 8mm, 10mm, 12mm, 16mm, 18mm, 20mm, 25mm, 30mm, 35mm. Comes with a exquisite packaging box, the product is not easy to lose, convenient for carrying and storage. Specifications: Name: Drill Bit Set Material: metal+daimond Type: 12pcs plastics box set, 10pcs wooden box set (optional) Package size: 12pcs plastics box set: 200 * 150 * 50mm / 7.87 * 5.91 * 1.97in 10pcs wooden box set: 195 * 130 * 47mm / 7.68 * 5.12 * 1.85in Package weight: 12pcs plastics box set: 670g / 1.48lb 10pcs wooden box set: 540g / 1.19lb Packing List: 1 * Drill Bit Set