This genuine MTD 01005381NA mulching blade is a high-quality replacement part designed for 21-inch (530mm) cutting decks. It features a 6-point star center hole and two 8mm outer holes spaced 63.5mm apart, ensuring precise fitment. With a width of 56mm and a thickness of 3mm, this durable blade provides efficient mulching for a clean, healthy lawn. It is compatible with a wide range of MTD Group brands, including MTD, Cub Cadet, Yard-Man, Gutbrod, Bolens, Columbia, Massey Ferguson, White, and Troy-Bilt lawn mowers. Replaces OEM part numbers 74204050 and 94204050, along with their various suffix versions.