The OEM NOS STIHL Spur Sprocket 1121-640-2005 is a replacement part for a STIHL chainsaw. This sprocket is designed for a 2-stroke engine that runs on gasoline, and is compatible with STIHL chainsaws from the year 2005. It comes in a pack of 1, making it ideal for anyone in need of a replacement sprocket for their outdoor power equipment. The durable construction and precise engineering of this product ensure a smooth and efficient chainsaw operation.