Husqvarna Sharp Force File Guide allows you to sharpen your chain cutter and maintain the height of your depth gauge in one operation, without removing the chain from the bar. Built-in angles and guides ensure proper filing technique for easy, professional results regardless of experience level. The tool uses standard round files and a special depth gauge file. After the left teeth are sharpened, the files may be reversed to sharpen the right teeth. For this reason, avid filers may want to purchase two units. The height of the raker is maintained in proportion to tooth wear. Comes complete with one 3/16" round file and one depth gauge file, packaged in a plastic case, with full instructions. The 3/16" model works on all .325 pitch chains. Works on full comp chain only. It's a good idea to pick up a few spare Husqvarna 3/16 files wile you are at it (#HVA 505 69 81 47).