The MTD 7420647 is a genuine OEM 21-inch 6-point star blade, designed for a wide range of MTD, Cub Cadet, Troy-Bilt, and other MTD family brand lawn tractors. This durable blade, with a length of 533.4 mm (21 inches), a width of 57.15 mm (2.25 inches), and a thickness of 3.81 mm (0.15 inches), features a 6-point star center hole for secure mounting. It is engineered to provide efficient cutting performance and a clean, precise cut for maintaining your lawn.