Stihl's 2 in 1 Guide for their 33 chains for MS 311, MS 391, MS 400, MS 462 and up using a 3/8" Chain.
The STIHL 2 in 1 Filing Guide gets more done in a few strokes. Sharpen your saw chain cutters and lower your depth gauges at the same time with this simple and unique accessory. Designed for ease and accuracy, this filing system includes two round files, one flat file, and a unique file holder and guide. With the STIHL 2 in 1 Filing Guide, spend less time sharpening your saw chain and more time putting your chainsaw to work.