Features: This is a practical milling cutter used to enlarge, shape or form existing holes in stone, creating recesses to fit pipes or wires. Using brazing technology, the deformation is small and the is glossy, suitable for finely processed workpieces, and can provide efficient work performances. Selected particles can effectively improve the sharpness and wear resistance of the drill. The precise thread design can firmly fix the trimming machine to ensure that it is not easy to fall during operational. The drill bit is used to install on the angle grinder and is suitable for the trimming and reaming of marble, granite, ceramic tiles and other stones. Specifications: Component:Steel+Diamonds Size:6mm/8mm/10mm/20mm/25mm/30mm Package Includes: 1Pc Finger Bit note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.