This 20PCS diamond grinding bits set features 120 grit diamond coating for efficient engraving, carving & polishing on glass, jade, ceramic, and other hard materials. The 1/8inch shank fits most rotary tools, making it ideal for jewelry making and DIY crafts. Includes 6 practical head shapes (ball, cylinder, ball-nose cylinder, cone, oval, and tree) with 6mm head diameter and 45mm total length. Perfect for detailed work in different angles and surfaces. High-quality diamond coated rotary burr set provides long-lasting abrasion resistance. The 120 grit diamond grinding bits offer balanced material removal speed and fine finishing for professional results. The 1/8inch diamond drill bit shank works with most standard rotary tools. Great for artisans, hobbyists, and professionals working on delicate projects requiring precision grinding stones. This diamond grinding burr set for rotary tool covers needs from rough shaping to final polishing. Essential for glass engraving, stone carving, ceramic refinishing, and craft projects. Color: As Shown Material: Metal Package Contents: 20pcs x Diamond grinding head 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.