Sharpen your chainsaw with the CountyLine Round Chainsaw Chain File and Filing Guide Set. This chainsaw file is designed to work with all chains requiring 7/32 in. (5.5 mm) files. Precision engineered from durable steel, this chainsaw sharpener delivers smooth and efficient sharpening. And thanks to the included guide, you'll be able to get the proper angles. Instructions for sharpening are included on the product label for safe use. Remember; a sharp chain is a safe chain; check chain frequently and sharpen as needed.