Diamond stone sharpener. Easy to use and saves a lot of time cutting easily and piling up firewood quickly. Takes a dull chain and makes it as sharp as new and it holds its edge like a new chain!
Practically unbreakable. Simple to use. Other than that worth every penny. I'm ordering another one in case the first one goes missing.
The high price you are paying is without the chain as pictured. Slips and bends lighter weight posts. Very misleading and a very poor way to merchandise.