Blade for lawn tractor lawn mower jet 50 partner 50 roper 20" for 51cm deck A: 508mm B: 16mm C: 9.5mm D: 48mm E: 4mm F: 62mm A: diagonal blade length B: centre hole dia. C: centre hole dia. D: distance between centre holes E: blade thickness F: width of blade HUSQVARNA Code: R302492 Original Code: 532850972 AT