This right-side knife is the cutting component for the disc mower cutter bar. It bolts to the disc hub and severs crop material through impact with the stationary counter-knife mounted on the mower frame. The knife is the primary wear interface in the cutting system; a dull or damaged edge increases power draw and produces a ragged cut that slows field drying. As an original component, the hole spacing and blade thickness match the disc mounting pattern and the counter-knife gap, so no shimming or adjustment is needed at installation. Torque the retaining bolt to the manufacturer's specification and inspect the counter-knife for wear when replacing the blade.