Goldenwide&reg; Big Combo of Diamond Burr Set &ndash; 1/8-inch Shank Diamond Grinding Needle Carving Polishing Set, 50-Piece Grit 120, 30-Piece Titanium-Coated Grits 120-150, 20-Piece Grit 180 Big combo of diamond burrs set: including drill bits of 50-piece grit 120, 30-piece titanium-coated grits 120-150, 20-piece grit 180. Designed for rotary tools. Assorted shapes and sizes include: ball, cone, rounded cylinder, flat top cylinder, tapered & needle point All burrs with shank size: 1/8-inch, compatible with most die grinders or rotary tools Great for Working with Ceramics, Tile, Stone, Glass, Metal & More. Highly recommended for jewelers, lapidary use, hobbies, crafts, craft modeling, home repair and so much more. 100% LIFETIME GUARANTE : 100% lifetime worry-free guarantee. 100% Satisfaction with no questions asked. We will fully refund if you received the set broken, rust or any problems.