The STIHL MS 251 WOOD BOSS® Chainsaw is powerful, fuel-efficient and easy to use. Ergonomically designed to bring you maximum comfort during use, this tool produces 50 percent less emissions (as compared to previous models) for a smaller impact on the environment. The MS 251 WOOD BOSS® packs features like a Master Control Lever™ and easy-to-refill fuel and oil tanks, so you can worry less about starting and operating your equipment, and have more time getting your outdoor jobs done. *A majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components.