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 crafts, and are good helpers for grinding, grinding, drilling, cutting, engraving, etc. Capable of engraving on a variety of materials, including: tiles, ceramics, marble, granite and other hard materials. In home decoration or crafts, 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