This Kramp K7420641MTD lawnmower blade is a high-quality replacement part designed for MTD lawnmowers with a 530mm (21 inch) cutting width. Featuring a star-shaped central bore, it ensures a secure fit and efficient cutting performance. With a length of 530mm, width of 57mm, and thickness of 3mm, this blade is engineered for durability. It directly replaces MTD OEM part numbers 742-0641, 742-0641A, 742-0641B, 942-0641, 942-0641A, and 942-0641B. Ideal for maintaining a clean and even lawn cut on various MTD models.