The STIHL 56057504304 2-in-1 Filing Guide is an innovative and genuine STIHL tool designed for easy and accurate sharpening of saw chains with a .325 inch (8.255 mm) pitch. This compact unit integrates a filing guide, a 4.8 mm (3/16 inch) diameter round file, and a depth gauge file. It ensures correct sharpening angles and precise depth gauge settings, which are crucial for optimizing cutting performance and extending the service life of your saw chain. This filing guide is an essential accessory for maintaining STIHL chainsaw chains that require a .325 inch pitch and a 4.8mm file diameter.