Using a Roller File Guide to properly sharpen your chainsaw and set depth gauges or rakers. Link to the products... Oregon Gauge-It www.amazon.com/gp/product/B001SCQ6PC/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B001SCQ6PC&linkCode=as2&tag=tallfarmboy-20&linkId=00b6b19ed2afc83e3b78da3864487d42 Husqvarna Roller File Guide www.amazon.com/gp/product/B00N9USDWU/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00N9USDWU&linkCode=as2&tag=tallfarmboy-20&linkId=0fe7f44019647d5c374bda4a8bbef05e