[Material]It is made of alloy material, which has the characteristics of strong hardness, strong wear resistance, corrosion resistance and soft contact. It is a durable product.Scope of application: 2-in-1 4.0mm Easy File Compatible with Stihl 56057504303Gooddesign: This practical chainsaw file comes with a handle design, which is easy to operate, allowing users to operate directly on the chainsaw without hurting their fingers, doing their best to provide customers with satisfactory service.Product Size:4.0mmefficient use: Chainsaw sharpening kits are not only fast but accurate. It will wear off your dull chain in a short time, sharpen any chain quickly and easily and make your chain sharper.