This 21-in. Self-Propelled RWD Gas Push mower has a 163cc Briggs & Stratton engine and one-step starting which requires no priming. The 3-in-1 deck capabilities allows you to side discharge, mulch and help put nutrients back in your soil for a healthier lawn or bag for easy clean up or composting. This mower has 6 position height adjustment makes it easy to change cutting heights from 1.25-in to 3.75-in high. • Added traction - Rear wheel drive delivers added traction and control on flat, hilly or uneven terrains • Mowing convenience - 21-in 3-in-1 convertible deck for side discharge, mulching or rear bagging • Dust blocker bag - Reduces messy dust clouds • Pace control system - Comfortably walk at your own pace while the mower automatically adjusts to match your natural stride