Material: Made of alloy, which has the characteristics of high hardness, high wear resistance, corrosion resistance and a smooth feel. It is a durable product. Scope of application: Simple 2-in-1 4.0 mm file compatible with Stihl 56057504303. Good design: This chainsaw file. The practical tool comes with a neat handle, which is easy to use, allowing users to use it directly on the chainsaw without hurting their fingers, and does its best to provide customers with satisfactory service. Product size: 4 mm. Efficient use: chainsaw sharpening kits. These sharpeners are not only fast but precise. They will wear out in no time and will sharpen all tools quickly and easily and will make your chain no longer sharp. Product performance: It is made of alloy, which has the characteristics of high hardness, high wear resistance, corrosion resistance and a smooth touch. It is a durable product. Compatibility: Simple 2-in-1 4.0 mm file compatible with Stihl 56057504303. Product dimensions: 4 mm. Good quality: Robust, thick, not easy to bend, with overheating and overvoltage protection. Especially in summer, it does not get 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 a case. Whether it is the internal chip or the appearance, we have carefully checked it by engineers and designers, and it is more in line with the original, so it can perfectly replace the original charger.