The MTD 7420542 is a genuine OEM standard 21-inch mower blade designed for a wide range of walk-behind mowers from brands including MTD, Cub Cadet, Troy-Bilt, Yard-Man, Yard Machines, Huskee, Bolens, White Outdoor, Ryobi, Craftsman, and Gold Series. This durable blade ensures efficient cutting performance for 21-inch decks. It features a 6-point star center hole and replaces multiple previous part numbers.