Blade for lawn tractor mower mower 21" A: 530mm B: 21.5mm C: 10. 5mm D: 90mm E: 4mm F: 57 mm A: Diagonal blade length B: Centre hole diameter C: Positioning hole diameter D: Positioning hole distance E: Blade thickness F: Blade width HONDA Part No.: R300587 Original part No.: 72450 ALSO COMPATIBLE WITH KAAZ LM530 535 536 R.O. 91014159 ALSO COMPATIBLE WITH YANMAR YL53TS YL53TSE R.O.: 676145120 AT