The 1pcs Cam Shaft Pulley Nylon Gear Wheel is an essential spare part designed to fit the 139F Gasoline Engine Motor used in lawn mowers and grass trimmers. Crafted from durable nylon material, this gear wheel ensures longevity and reliable performance in demanding outdoor conditions. It serves as a replacement for worn-out or damaged parts, maintaining the smooth operation of your equipment. With precision-engineered design, installation is straightforward, providing a hassle-free replacement process. This gear wheel is a high-quality spare part that guarantees optimal functionality and compatibility with various grass trimmer models, making it an indispensable accessory for your gardening tools.