This knife section is the cutting element mounted on the header of a grain harvesting combine. It is the component that severs the crop stem as the reciprocating knife drive moves it past the stationary counter-knife. The knife section is bolted to the knife back using two fasteners through the provided holes. The cutting edge is the forward face that contacts the crop; the thickness and hole spacing match the original assembly geometry so the section aligns correctly with the guards and ledger plates. A dull or damaged knife section causes ragged cuts, increased header vibration, and higher power draw from the knife drive. Using a section that matches the original hole spacing and thickness ensures the knife assembly maintains proper register with the guards, reducing the risk of stem pull or plugging.