This left-side moldboard bar is the curved steel plate that forms the rear working face of the plow body. It receives the soil lifted by the share and inverts it into the furrow. The bar is shaped to produce the XXL furrow profile, which determines the width and turning action of the slice. Two mounting holes secure it to the frog. A worn or deformed bar reduces furrow inversion, leaving residue on the surface and increasing draft force. The original manufacturer's forming die matches the curvature of the mating right-side bar, ensuring the two halves close evenly across the furrow wall.