Husqvarna OEM Replacement Blade 340-226
Requires 3 for 54'' deck; hi-lift blade 
Length 18 1/2'' (469.9mm)
Centre Hole 5 pt. star 
Outer Hole 3/8'' (9.5mm)
Centre 3 3/4'' (95.3mm)
Width 2 3/4'' (69.6mm)
Thickness .187'' (4.7mm)