Feature:1. [Multipurpose] The lithium battery chainsaw sharpening kit is suitable for most chainsaw blades and can easily maintain your oil chain.2. [Stable Performance] The chainsaw sharpening kit is fine in workmanship, stable in performance and easy to use, so you can use it with confidence.3. [USB Charging] The chain saw sharpen tool set is compact and portable, and can be charged with USB, so you can take it anywhere.4. [Durable Material] Made of high quality ABS and steel material, which is durable, high hardness, safe and can be used for a long time.5. [5000‑18000r/min] The no load speed is 5000‑18000r/min, the voltage is 3.6V, and the charging time is 3‑5h, to meet your various need.How to Use:Guidelines for assembling the chain sharpener:1. Choose one that is slightly smaller than the chain teeth clearance2. Rotate out the original interface nut3. Rotate the grinding chain auxiliary nut clockwise to complete the installationAfter assembling the chain sharpener, you need to use the accessories for adjustment and testing:1. Use a wrench to loosen the height adjustable screw on the chain grinding aid2. Use auxiliary tools to select a suitable grinding head3. Adjust the grinding chain auxiliary tool plane to fit the chain4. After the adjustment,