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!

Just cut the protectors in the middle and add radial cuts from the center as needed. They hold up very well taking how thin they are.

They are paper thin and flimsy, the squares are too small and do not cover the area. Burned the inner edges closest to burner in first use and turned ashen and ugly. Not fit for my gas stove. Simply can not be reused.