Compatible with most die grinders and rotary tools as you finish, grind, and shape your work with precision. When the jobs or project is complete, you will be happy to place your burrs back into the compact storage case can organize, store, and transport this set for future use. Features - Color: Silver. - Material: Diamond. - Size: 4.50 x 0.20 x 0.20cm/ 1.77 x 0.08 x 0.08 inch. - And whenever you need to polish, grind, drill, cut, engrave, and more, used with most rotary tools. - Able to engrave on a wide range of materials including: wood, acrylic, PVC, plastics, etc. - Well-suited for detailed work, such as building and sanding dollhouse furniture, model trains, or miniature buildings, highly recommended for jewer. - Very fashion drilling burr tools used by designers for drilling holes in stones, rocks. - Has a on wooden crafts. Can be used for engraving and drilling of wood products. Package list: 30 x bits (2.35) 30 x bits (3.0)