How to Use: Guidelines for assembling the chain sharpener: 1. Choose one that is slightly smaller than the chain teeth clearance 2. Rotate out the original interface nut 3. Rotate the grinding chain auxiliary nut clockwise to complete the installation After 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 aid 2. Use auxiliary tools to select a suitable grinding head 3. Adjust the grinding chain auxiliary tool plane to fit the chain 4. After the adjustment, tighten the height adjustment screw Specification: Item Type: Chainsaw Sharpener Material: ABS, steel After Installation Product Length: Approx. 25cm / 9.8in Chuck Capacity: Φ3.2mm Battery: Li-ion battery 1500MAH (Battery Included) Charging Time: 4-5h Working Time: 40-60 minutes Speed: 5000-18000 rpm/min Weight: Approx. 385g / 13.6oz Color: Red Package List: 1 x Chainsaw Sharpener (Battery Included) 1 x Mounting Head 1 x USB Connecting Line 13 x Accessories