The STIHL MS 251 WOOD BOSS® Chainsaw is designed to deliver all the power you’d expect from STIHL equipment, yet with a comfortable and ergonomic design. The MS 251 WOOD BOSS® is perfect for felling small trees, pruning and thinning, and cutting firewood simply and efficiently. And with up to 20 percent fuel savings and 50 percent reduced emissions (as compared to previous models), you can enjoy a longer run time while feeling good about your impact on the environment.