This knife is the cutting element for a disc mower. It is mounted on the mower disc and impacts the crop against a stationary counter-knife to sever the stems. The blade is a flat, straight design with a mounting hole for bolting to the disc carrier. A dull or chipped knife increases power draw and leaves a ragged cut, which slows crop drying in the swath. The manufacturer machines the blade to the same thickness and hole position as the original assembly, so it aligns with the counter-knife without shimming. When replacing, install a new bolt and torque it to the specification for the disc.