The Lawn-Boy 20 in. Kohler engine Self-Propelled Walk-Behind Mower provides the power and maneuverability ideal for trimming even tough grass. The self-propelled rear wheel drive provides better traction in all cutting conditions. The 7 in. front and 8 in. rear wheels provide solid traction to maneuver around all types of terrain while the multi-notched blade cuts grass into fine clippings for a clean cut.