Waste of money...
I bought this expecting it to firmly put the file exactly where it is needed. It does not really do that, you still have to judge the angle by aligning the two marks on the top of the sliding pieces. Holding this angle is a pain and the two halves move when you file. I actually find just using a round file by hand easier to achieve good results. I am a paid up member of the Stihl fan club, but I think this really lets the brand down.
Verified purchase: YesCondition: New