Professional chain saws for the most demanding jobs These versatile, powerful chain saws are engineered for the professional who demands performance. STIHL's professional saws offer excellent power in a lightweight package. Also, STIHL's precision-balanced saws provide outstanding handling and reliability under the most difficult cutting conditions. Their excellent power-to-weight ratio and perfect ergonomic form reduce operator fatigue when cutting medium to big size timber. Displacement(cm3)- 121.6, Power(HP)- 8.7, Weight(lb)-21.8