Made of high hardness emery for durabilityEmery is a hard and rough mineral that makes the diamond sharpener a fine and natural abrasive used on metal for sharpening and derusting to remove burrs, they make sharpening a simple and effective task. Cost savingYou don't need to buy a new chain, it will save you a lot of money. Diamond chainsaw sharpeners make sharpening much easier, you can sharpen a chainsaw to like-new condition in just a few minutes. Keep Your Chainsaw Cutting EfficientlyWhen you sharpen your chainsaw chain with the sharpener, it takes less effort to cut through wood because your chain will make cleaner cuts with sharp blades. Sharpens Well to Extend Chainsaw Engine LifeSharpens very well, a sharp chain cuts quickly and in a relatively straight line. A well-sharpened chain will extend the life of your chainsaw engine.