The Mini Diamond Burrs Drill Bits are the perfect tool for fine detail work, cutting, engraving, carving, finishing, jade grinding, and mold repair. Made with a diamond-coated material, these drill bits are ideal for grinding jade, ceramic, glass, wood, precious stone, and other abrasive materials. They can easily be installed on electronic grinders, engraving machines, hanging mills, and hand electric drills. Each package contains 5 diamond burrs with a cylindrical ball nose shape and a 2.6mm head diameter. With a total length of 60mm and a 2.35mm shank diameter, these drill bits are designed to provide precision and efficiency in your projects.