This bottom knife section mounts on the cutterbar of a combine harvester header. It is the lower, serrated blade that works against the upper knife section to shear crop stems during the cutting stroke. The two mounting holes align with the knife-back and hold the section in position for consistent cutting geometry. A worn or dull bottom knife section causes ragged stem cuts, increased header vibration, and higher draper or auger losses. Rasspe manufactures this section to the original profile and hole spacing, so it seats flush against the knife-back without shimming. When replacing, use new bolts and torque them to the specification for the header knife drive.