STIHL FG4 roller filing tool

The STIHL FG4 roller filing tool is a compact filing tool that makes it possible to smoothly and accurately file your STIHL saw chain with little effort.* Aside from sharpening, you can also use the STIHL FG4 roller filing tool to check and adjust the depth gauge setting. * The FG4 roller filing tool is designed for sharpening cylindrically ground STIHL Oilomatic saw chains -- with the exception of carbide-tipped saw chains.