Professional range - Mulching blade RH for AYP 21 with front wheel drive - L: 533mm, central bore: 16,1mm, pitch center: 48mm. Replaces original: 532 19 93-77, 532 40 67-12, 532 17 50-64, 532 18 90-28, 532199377, 532406712, 532175064, 532189028, 599377, 165833, 175064, 189028, 4067127.