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 have strong corrosion resistance, Strong Pressure Resistance and Durability.Easy to Install: It is As Easy to Use as a Pencil Sharpener; Simply place the pliers on the shank, position the ratchet on the tooth, insert the reamer into the guide sleeve and turn the handle.Portable: Crank chainsaw sharpeners are convenient for outdoor use and Have Strong Safety That Can Protect Your Hands From Injury.Precise Maintenance: Every Time You Sharpen A Tooth, All You Need To Do Is Pull The Chain. Precise sharpening can ensure that every tooth is repaired! Precise Positioning: The ratchet serves as a stop to ensure precise and repeatable positioning of the teeth.Perfect Design: To adapt to different types of chains with different holes, the chain saw sharpeners are equipped with 2 holes For fixed sharpening, one hole is fixed and the other moves back and forth, very flexible.