A. Material: It is made of alloy materials, with features like relatively high hardness, strong wear resistance, corrosion resistance, and a soft touch. It is a rather durable product. B. Applicable scope: It is suitable for the two - in - one 4.0 - millimeter simple file compatible with STIHL 56057504303. C. Good design: This practical chainsaw file has a handle design, which is relatively convenient to operate. It enables users to operate directly on the chainsaw without easily hurting their fingers, and aims to provide customers with satisfactory services. D. Product size: 4.0 millimeters E. Efficient use: The chainsaw sharpening kit is relatively fast and accurate. It can grind off the dull chain in a relatively short time and easily and quickly sharpen any chain, making the chain sharper.