Blade for lawn tractor mower mower HTR3900 A: 755mm B: 26mm C: 12.5mm D: 110mm E: 4.5mm F: 70mm 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 HONDA Code: R303930 Original Code: 72513751020 AT