The innovative shape of the STIHL Hexa file is perfectly matched to the teeth of the 3/8" Hexa saw chain. This makes it easy for professional or domestic users to sharpen the saw chain at the ideal angle and very precisely. The angle of the cutting tooth on the STIHL saw chain is perfectly matched with this STIHL Hexa file, meaning that you can sharpen the depth gauge quickly and precisely. This saves time and ensures a longer service life for the full-chisel chain.