Husqvarna OEM Replacement Blade 302-436 
Requires 3 for 50'' deck; not recommended for use with mulch kit; recommended to use 285-383 heavy-duty spindle assembly; toothed blade
Length 17 3/8'' (441.2mm)
Centre Hole 5 pt. star 
Width 2 1/2'' (63.5mm)
Thickness .187'' (4.7mm)