This left-side runner is the long, XXL-profile wear component that slides along the furrow wall behind the plow body. It is fastened to the frog or leg of the plow using three plow bolts (M12 x 35 mm) through the pre-drilled holes. The runner maintains the correct working depth and lateral stability of the plow body by contacting the undisturbed furrow bottom. As the runner wears, the plow body sinks deeper and the furrow profile becomes inconsistent, requiring replacement to restore consistent draft and depth control. A matching right-side runner is available as a separate part. When reinstalling, use new plow bolts and tighten them to the specified torque.