This knife is the component that severs the corn stalk at the base before the plant enters the header intake. It is mounted on the gathering chain assembly, where its cutting edge engages the stalk as the row unit advances. A dull or damaged knife causes ragged cuts, which can lead to stalk slippage and uneven feeding into the snapping rolls. The original geometry of this knife matches the factory-specified gap to the stationary shear bar, ensuring a clean cut without requiring shimming or adjustment on installation.