Blade for lawnmower mower 21" AP21 AP20 AP211 AP212 A diagonal blade length: 532mm B Centre hole: 9.5mm C Positioning holes distance: D Positioning holes distance: E Blade thickness: 4mm F Blade width: 70mm ARIENS Code: R302484 Original code: 11285 01137000 also compatible with husqvarna for 21" deck R.O.: 1128501137000 AT