The Pferd CS-X Chain Sharp filing 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 CS-X filing guide allows you to sharpen both left and right hand cutters, unlike the original Chain Sharp. The tool uses standard round files and a special depth gauge file (17310). The height of the raker is maintained in proportion to tooth wear. Comes complete with one file and one depth gauge file, packaged in a plastic case, with full instructions. Works only on standard full comp chain (non skiptooth).