Middle or rear concave with built-in extension. Round bar, used for high moisture corn. Includes 1/4" diameter cross wires for use in soybeans. Fits Case-IH combines 1680, 1688, 2188, 2377, 2388, 2577, 2588, 5088, 6088, 7088, 5130, 6130, 7130, 5140, 6140, 7140.2 used per machine. ** Made in the USA. Ships direct from the manufacturer.