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The 150 mm sharpening file is a professional tool designed to maintain and restore the cutting performance of compatible Silky saw blades. Made from high‑grade steel with a diamond‑shaped profile, this larger file gives you a longer working surface than the standard 100 mm version, making it easier to sharpen a wider range of saw tooth patterns on blades that are not impulse‑hardened. Regular sharpening with a file like this helps you keep more cutting performance from your saws and can extend the useful life of blades that are meant to be maintained in the field. Perfect for forestry, arborist, and outdoor professionals who regularly use Japanese pull saws.