Quality materials: the chain sharpener is suitable for 12-20 inch chainsaws, the main body of the chainsaw chain sharpener is made of aluminum alloy and stainless steel, which has strong corrosion resistance, strong pressure resistance and Durability. Easy To Install: It Is As Easy To Use As A Pencil Sharpener; Simply place the collet over the shank, position the ratchet over the tooth, insert the reamer into the guide sleeve and turn the handle. Portable: Hand Crank Chainsaw Sharpeners Are Convenient For Outdoor Use And Have Enhanced Safety Which Can Protect Your Hands From Injury. Accurate Maintenance: Every time you sharpen a tooth, all you have to do is pull the chain. Precise Sharpening Can Ensure Every Tooth Is Repaired! Precise positioning: The ratchet serves as a stopper to ensure precise and repeatable positioning of the teeth. Perfect design: To adapt to different types of chains with different holes, the chainsaw sharpeners are equipped with 2 holes for fixed sharpening , One Hole Is Fixed And The Other Moves Back And Forth, Very Flexible.