Easy to use: With a recommended speed of 800-1000rmp, our drill bit is easy to use and can be used with any standard 6.3mm/0.25inch hexagonal shank drill. Simply apply light pressure to locate the drilling position and gradually increase the speed for optimal results. cutting trajectory: The offset design of our drill bit creates a cutting trajectory, with the main and secondary blades working together to provide precise and clean cuts. Long-lasting: To the of our drill bit, it is recommended to use it with water cooling and avoid drilling through steel reinforcement. With proper use and maintenance, our drill bit can last for a long time, making it a cost-effective choice for your drilling needs. High-speed drilling: Our innovative four-blade eccentric ceramic drill bit allows for fast and efficient drilling, making it easy to locate and drill through various materials such as wood, marble, metal, glass, wall tiles, and concrete. Package Includes: 5 different size of bit, respectively 5mm 6mm 8mm 10mm 12mm, 2 of each, a total of 10, hexagonal shank design (6.3mm/0.25Inch) , Suitable for most hand-held electric drills., Manufacturer: Ounfhtrttk