Variety of Shapes: The diamond drill bit set for rotary tools includes 20pcs in total, designed in various shapes, such as spherical, pointed cone, cylindrical, oval, bullet, flat rectangular, etc. Different models and wide range of shapes. Will meet your different needs.No matter what shape you need to engrave or polish, our diamond drill bit set can meet your needs. Multifunctional: Diamond drill bits are ideal for home decoration and decoration. crafts, and are good helpers for grinding, grinding, drilling, cutting, engraving, etc. Capable of engraving on a variety of materials including: tile, ceramic, marble, granite and other hard materials. In home decoration or craft making, diamond drill bits are an essential tool. It can engrave a variety of hard materials, showing exquisite craftsmanship. Material: Diamond drill bits are made of reliable quality diamond particles, thick and durable, wear-resistant, high hardness, impact resistant and durable enough for fine detail work. In the production of crafts, diamond drill bits can easily handle various fine detail work, and their high hardness and wear resistance ensure that they will not be deformed or worn after long-term use. Universal Compatibility: The 20pcs diamond drill bit kit comes with a universal drill bit with a 3mm shank compatible with most rotary tools. No matter which rotary tool you use, the diamond drill bit set is compatible with it to make your work easier. Improve efficiency: The grinding speed and precision of diamond drill bits are very high, which can greatly improve work efficiency. In a manufacturing or processing operation, time and efficiency are essential. The efficient grinding speed and precision of diamond drill bits can greatly improve work efficiency, saving you time and labor. Strong durability: Diamond drill bits have a long service life and there will be no obvious wear or performance degradation after long-term use. Diamond drill bits have a very long service life due to their high hardness and wear resistance. Even with long-term use, there will be no obvious wear and performance degradation.