AH206174 New Front Round Bar Concave Fits John Deere Combine 9560STS 9570STSOne New Aftermarket Replacement Front Round Bar Concave Fits John Deere (Fits JD) STS Combines This aftermarket replacement front round bar concave installs in the front concave position of the threshing system on Fits John Deere STS combines. Round bar concaves feature solid round steel bars with no wires, providing a more open threshing surface that excels at separating high moisture corn, soybeans, and specialty crops. The concave is heat treated