All burrs with a 3mm - compatible with most die grinders or tools. Assorted shapes and sizes include: ball, cone, cylinder, needle point, and tapered. Highly recommended for crafts, hobbies, home repair, jewelry, lapidary use, modeling, and so much more. The titanium-coated diamond material ensures these burrs are tough and made to last. Application:jewelry , home , and wood making Function :For Wood Metal Ceramic Plastic Drilling Polishing Grinding Carving Shaping and Sanding. Mainly used for electric and pneumatic tools: the diamond grinding head is made of high-grade multi-angle diamond electroplating, which is a perfect repair tool for processing molds, hard alloys, glass instruments, jade carvings, etc. Note: due to different production batches, the packaging color is random, cannot the specified color Diamond grinding head set diameter: 3mm color:Silver Material:Metal Package Contents: 30 x grinding head set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.