These include: Rounded file File guide Flat file Depth gauge Protective eyewear You can get all of these, except the eyewear, in a good chainsaw sharpening ... On the other hand, a dull blade ...

Generally, you can sharpen a chainsaw between three and 10 times. There are laser markings on the chain that indicate how far you can file it back. Once you reach those, it's time to get a new chain.