The MTD 74204312A is a genuine OEM 21-inch mulching blade designed for various MTD, Cub Cadet, and Troy-Bilt walk-behind and push lawn mowers. This high-quality blade ensures efficient grass cutting and mulching performance. It features a precise 6-point star center hole for secure attachment and measures 533.4 mm in length, 57.15 mm in width, and 3.81 mm in thickness. Replace worn blades with this MTD original part to maintain optimal mower performance and a clean cut.