This straight knife is the cutting element on a disc mower. It is mounted on the rotating disc and severs crop material through impact with a stationary counter-knife. The blade's geometry determines the cutting angle and the quality of the stubble left behind. A dull or damaged knife increases power draw, produces ragged cuts, and can lead to uneven regrowth in the field. The original manufacturer's profile matches the disc's mounting pocket and the counter-knife's wear pattern, so the cutting gap is maintained without adjustment. When replacing, inspect the mounting bolts and torque them to the specified value.