This is a high quality aftermarket piston and cylinder kit to rebuild your Husqvarna 357 or 359 chainsaw. This is a big bore kit for your 357 and standard bore for your 359. This kit turns your 357 into a 47mm bore 359. No carb or muffler mods needed- direct fit for either saw. Kit includes NIKISIL coated cylinder, piston, ring, pin, clips, and gaskets