Yard-Man 123-246C401 is a 21-inch 6-speed self-propelled lawn mower with a rotary cutting system. It is a powerful and versatile machine that can handle a variety of mowing tasks. The 6-speed transmission provides a range of speeds to choose from, so you can select the right speed for the conditions. The self-propelled drive makes it easy to mow even large lawns, and the 21-inch cutting width allows you to cover a lot of ground quickly. The Yard-Man 123-246C401 also features a number of safety features, including a blade control handle that must be engaged to start the engine.