This knife is the undercutter blade for a corn header, mounted at the front of the row unit to sever the stalk base before it enters the gathering chains. It interacts with the deck plate and the gathering chain assembly to create a clean cut, reducing the pulling force required from the header. A dull or worn blade causes ragged stalk breaks, which can lead to plugging at the auger or uneven feeding into the threshing mechanism. The manufacturer machines this blade to the original hole pattern and edge geometry so it seats flush against the mounting bracket without shimming. On installation, use the correct hardware and torque the mounting bolts to the specified value.