This is Stihl's BT 131 earth auger it is a high performance and lightweight tool professionals need for post-hole digging, fence installation, large planting projects, environmental restoration and construction projects. It's featuring a powerful, fuel-efficient engine and a larger fuel tank than previous models, this auger works longer with fewer refuels. It also features a vertical pleated air filter for improved air supply quality and extended service life. Its semi-automatic choke lever enables a simplified starting procedure that reduces the chance of flooding, while the STIHL Quickstop® auger brake is designed to automatically stop the auger bit from turning if it hits a hard underground impediment.