This genuine MTD 7420496 mulching blade is designed for 21-inch walk-behind lawn mowers manufactured in 2009 and after. Featuring a 6-point star center hole, this 533.4 mm (21-inch) blade provides efficient mulching performance. It is a direct replacement for OEM part numbers 742-0496, 742-0496A, 742-0496B, 942-0496, 942-0496A, and 942-0496B, ensuring optimal fit and function for compatible MTD, Cub Cadet, and Troy-Bilt models.