<p> <p>Variety of Shapes: The diamond drill bit set for rotary tools includes 20 pieces in total, designed in various shapes, such as spherical, pointed cone, cylindrical, oval, ogive, flat rectangular, etc. Different models and a wide range of shapes will meet your various needs. No matter what shape you need to engrave or polish, our diamond drill bit set can meet your requirements.</p> <p>Multifunctional: Diamond drill bits are ideal for home decoration and crafts, and are good aids for grinding, milling, 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 crafting, diamond drill bits are an essential tool.</p> It can engrave a variety of hard materials, showcasing exquisite craftsmanship. Material: The diamond drill bits are made from reliable, thick, and durable diamond particles. They are wear-resistant, high-hardness, impact-resistant, and durable enough for fine detail work. In craft production, diamond drill bits can easily handle various fine detail tasks, and their high hardness and wear resistance ensure they won't deform or wear out after long-term use. Universal Compatibility: The 20-piece diamond drill bit set 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 to make your work easier. Improve Efficiency: The grinding speed and precision of the diamond drill bits are very high, which can significantly improve work efficiency. In manufacturing or processing operations, time and efficiency are essential. The efficient grinding speed and precision of diamond drill bits can significantly improve work efficiency, saving you time and labor. High durability: Diamond drill bits have a long service life, and there will be no obvious wear or performance degradation after prolonged 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 or performance degradation.</p>