The ZT HD from Gravely elevates expectations of style, comfort, speed and precision. A #1 Selling Machine in its class and built to commercial standards for power and durability. The 5.5-inch deep deck delivers superior airflow to handle challenging mowing conditions and includes a reinforced leading edge. A superior and more robust, welded tubular frame, offers the integrity of a commercial frame in a residential package. Switch gears from ordinary performance with a commercial-grade, high-efficiency design that delivers responsive control and increased torque.