Made of High Hardness Emery for DurabilityEmery is a hard, rough mineral, making the diamond sharpener a fine, natural abrasive used on metal for stripping and rust removal for removing burrs, They make sharpening an easy and efficient task. Keep Your Chainsaw Cutting Efficiently Sharpening your chainsaw chain with the sharpener, it takes less effort to cut through wood due to your chain will make cleaner cuts with sharp blades. Assorted Size Package includes 6 pieces of 5/32 (4mm)chainsaw sharpeners3 pieces of 3/16 (4.8mm) , 3 pieces of 7/32 (5.5mm). Can be used to sharpen saw chain on both gas and electric chain saws. Sharpens Well Prolong Lifespan of the Chainsaws EngineSharpens very well, a sharp chain cuts quickly and in a relatively straight line. A well-sharpened chain will prolong the life of the chainsaws engine. Cost SavingYou dont have to buy new chain, it will save you a lot of cost. The saw sharpening files make sharpening much easier, you can sharpen a chainsaw to like-new condition in just a few minutes. Specifications: Material: emery grain Color: gold Item: chainsaw sharpening tools Size: Assorted Size 5/32 3/16 7/32