PowerSmart 21 in. self-propelled gas lawn mower powered by a 140cc Briggs & Stratton engine. The durable 16-gauge steel deck and 3-in-1 mowing system support mulching, rear discharge and rear bagging. Six cutting-height positions adjust from 1.5 in. to 3.9 in. Self-propelled rear wheel drive and 10 in. rear wheels help reduce effort across uneven terrain.