Troy-Bilt TB170 XP Space Saver is a self-propelled lawn mower with a 21-inch cutting deck, powered by a 160cc Briggs & Stratton engine. It features a 3-in-1 design, allowing you to choose between mulching, side discharging, or rear bagging. The mower has a single lever height adjustment system, allowing you to easily adjust the cutting height from 1.25 to 3.75 inches. The TB170 XP Space Saver also features a compact design for easy storage, folding down to just 16.5 inches in height.