Blade for lawnmower mower HR173 A: 420mm B: 28mm C: 6x8.5 mm D: 50 mm E: 2mm F: 57 mm A: diagonal blade length B: centre hole dia. C: centre hole dia. D: positioning hole dia. E: blade thickness F: blade width HONDA Code: R301851 Original code: 72511VA9640 72511VA9010 AT