The Stihl 4137 640 0100 Genuine Brushcutter Strimmer Gear Head is a high-quality replacement part designed specifically for Stihl brush cutters. Made from durable metal material, this Gearbox is compatible with Stihl models such as FS100, FS85, and FS200. With a 2-stroke engine type and petrol power source, this gear head is easy to install and comes as a single unit, making it a convenient and reliable option for maintaining your lawn or garden. The gear head will fit numerous Stihl models fs85 fs90 fs100 fs130 fs200 fs80 and more.