ENGINE MADE IN THE USA: Briggs and Stratton E550 140cc gas engine equipped with Prime 'N Pull for easy starting, delivers reliable power and low noise. SELF-PROPELLED RWD SYSTEM: A rear-wheel-drive system provides great traction on inclined slopes and is suitable for uneven terrain. With single-speed 3.9-4.2 km/h. 21-INCH STEEL DECK: Rugged all-steel deck is built to last, and 21 in. superior mulching blade helps you finish mowing faster. ADJUSTABLE CUTTING HEIGHT: 6-position, 2-wheel height adjustment, lets you easily set the mowing height to your specifications. EASY TO MOW: This gas push mower assembles quickly out of the box, with no tools required.