JOHN DEERE 9610-9600-9510-9500 COMBINE CONCAVE INSERTS. INSERTS MAY BE REQUIRED WHEN HARVESTING HIGH MOSITURE OR HARD TO THRESH CORN. PREVENTS UNTHRESHED KERNELS FROM PASSING THROUGH THE OPEN AREA AT THE REAR OF THE CONCAVE. SET OF 16 TO FIT 9510-9500 - $250. SET OF 20 TO FIT 9610-9600- $275.