Big Horn 19401 20 Piece Diamond Burr Set. in flex shafts, moto tools or drills. 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.