Husqvarna OEM Replacement Blade 302-424 
Requires 2 for 38'' deck; not recommended for use with mulch kit; recommended to use 285-383 heavy-duty spindle assembly; toothed blade
Length 19 5/16'' (590.5mm)
Centre Hole 5 pt. star 
Width 2 1/2'' (63.5mm)
Thickness .187'' (4.7mm)