This knife mounts on the cutterbar of the parent combine and severs the crop stalk at the base. It is the replaceable cutting element that interacts with the opposing guard to produce a shearing action. A dull or damaged knife increases cutting force, leading to uneven stubble height and higher fuel consumption. The manufacturer machines this component to the original profile so it seats correctly in the knife clip and aligns with the guard ledger. When installing, ensure the knife sections are oriented in the same direction as the reciprocating drive and that all fasteners are torqued to specification.