1. The grinding wheel currently used in this product is brown corundum grinding wheel, so this product is mainly used for grinding iron drill bits. Other high hardness drill bits are not suitable, and the loss will be relatively large. 2. This Stonego Bit Sharpener is powered by a drill-driven spindle that spins a brown corundum grinding wheel and polishes the drill bit. The opposite hex socket handle (1/4") is suitable for electric and hand tools, pneumatic screwdrivers, etc. 3. Suitable for grinding 2.0-12.5mm drill bits, for grinding and repairing. > 4. Use an electric drill with a chuck to drive this tool. 5. Sharpen the drill bit to improve work performance. 6. Wear-resistant corundum < p>7. Good sharpening effect and labor saving. 8. Light weight, small size, easy to install and remove. 9. Applicable drill size: 5/64"-13/64 " (2mm-5mm) 7/32"-21/64" (5mm-8mm) + 11/ 32"-1/2" (8mm-12.5mm), angle and width can be 10. After use, keep it in a dry and clean place. Do not use with harsh chemicals, which may shorten the lifespan.