AH206455 New Middle / Rear Round Bar Concave Fits John Deere Combine 9560STS +One New Aftermarket Replacement Middle Rear Round Bar Concave Fits John Deere (Fits JD) STS Combines This aftermarket replacement round bar concave fits the middle or rear concave position in the threshing system of Fits John Deere 9560STS and 9570STS STS rotary combines. Heat treated for enhanced durability. Round bar concaves feature solid round steel bars without wires, making them well suited for harvesting corn, soybeans, and other large kernel