The CRAFTSMAN M300B 21-in self-propelled gas lawn mower has a 140cc Briggs and Stratton engine. The self-propelled single speed mower with rear wheel drive makes getting the job done easy. The M300B has a 3-in-1 deck that allows for side discharge, mulch, or bagging grass clippings. The dual-lever, 6 position height adjustment makes it easy for you to change the cutting height from 1.25 in to 3.75 in. The CRAFTSMAN M300B will help you get the job done right.