Blade for lawn tractor mower mower 410-425 21" flat A: 535mm B: 21mm C: 10mm D: 64mm E: 3mm F: 57mm A: Diagonal blade length B: Centre hole dia. C: Centre hole dia. D: Centre hole dia. D: Centre hole dia. E: Blade thickness F: Blade width MTD Code: R302614 Original Code: 9420721 7420721 AT