Diamond Coated Bur Set of 20 pieces for Grinding, Carving & Drilling in Soft Metals, Wax, Plastic, Clay, etc. Comes with a shank of 2.3mm which is standard for most Rotary Tools. Can be used by Professionals and also Personal Use. Complete in a plastic storage case it has 20 assorted shapes. This Diamond Bur set is designed to be used with high-speed rotary tools, grinders and drills. If you are a DIY enthusiast or hobbyist or crafter, this product will give your rotary tool even more functionality. Coated with tough diamond particles at its head. Great for carving, etching, grinding, sanding, etc. Note: Display on which image is viewed and shooting angles may cause the image to look a little different from the real thing.