The SWZT Hydro Walk-Behind might just be the smoothest walk-behind mower Scag has ever made. Ergonomic hand controls make driving the SWZT a pleasure. Dual ZT-2800 transaxles utilize all-metal internal gears for long life and deliver smooth, infinitely variable speed and bi-directional control. Ultra-comfortable, ergonomic controls not only contour to the natural angles of your extended arms, but are placed to keep your hands out of harms way when mowing next to trees and bushes. Combined with a floating, quick adjust deck and extra large drive tires, this is one serious walk-behind mower.