The MTD 7420497 is a genuine 21-inch mulching blade designed for various walk-behind lawn mowers from MTD, Troy-Bilt, Cub Cadet, and other associated brands. This durable blade features a 6-point star center hole, a length of 533.4 mm, a width of 57.15 mm, and a thickness of 3.81 mm. It is engineered to provide efficient mulching performance, returning finely cut grass clippings to the lawn, and weighs approximately 0.816 kg.