Blade for lawn tractor lawn mower A: 531mm B: 16mm C: 13mm D: 68mm E: 4. 5mm F: 71mm A: Diagonal blade length B: Centre hole dia. C: Centre hole dia. D: Positioning hole dia. E: Blade thickness F: Blade width KUBOTA Part No.: R320111 Original part No.: 611240 6682 682915 89844 612543 ALSO COMPATIBLE WITH LAWN BOY R.O: 611240 683682 682915 89844 612543 AT