Husqvarna XT721F 21-Inch 173cc Kohler Side Discharge/Mulch/Bag Gas Powered Lawn Mower With AutoWalk Front Wheel Drive The AutoWalk variable drive system allows you to mow at your own personal pace by simply squeezing the trigger on the handlebar. Double ball bearings on wheels ensures the mower rolls easily even after many years of use. Foldable handle for simplified transport and storage. Mulching grass returns vital nutrients back into the soil. 3-in-1 cutting system with mulching, rear bag, and side discharge capabilities.