Blade for lawn tractor lawn mower 18" flat mower rectangular attachment A: 456mm B: 4 points C: 8mm D: 63.5mm 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: R302631 Original code: 7420739 9420738 AT