Material: Made of alloy, which has the characteristics of high hardness, strong wear resistance, corrosion resistance and smooth contact. It is a durable product.Scope of application: 2 in 1 4.0mm easy file compatible with Stihl 56057504303Good design: This practical chainsaw file comes with a handle design, which is easy to use, allowing users to operate directly on the chainsaw without hurting their fingers, doing their best to provide customers with satisfactory service.Product size: 4mmEfficient use: Chainsaw sharpening kits are not only fast but accurate. It will wear out in a short time, sharpen any chain quickly and easily, and make your chain sharper.Product performance: It is made of alloy, which has the characteristics of high hardness, strong wear resistance, corrosion resistance and smooth contact. This is a durable product.Compatibility: 2 in 1 4.0mm easy file compatible with Stihl 56057504303.Product Dimensions: 4mmGood Quality: Sturdy casing, thick, not easy to bend, with overheating and overvoltage protection. Especially in summer, it will not be hot to the touch after prolonged use.Perfect Product: Excellent and perfect products are not only in terms of production, but also in design, whether it is internal chip cable or appearance, we have been carefully checked by engineers and designers, and more in line with the original, can perfectly replace the original charger.