20 Piece Diamond Burr Set. World's hardest abrasive, diamond burrs are long lasting. Use in flex shafts, motor tools or drills. 20 piece set has 1/8-Inch shanks in a large selection of shapes. Comes with plastic storage case.Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Use on wood, jade, ceramic, glass, hardened steel, semi-precious stones and other hard materials.