Jacobsen OEM Replacement Blade 330-316
FITS MODELS: X300 and LX series ; round centre hole interchangable with OEM star-shaped blades
Requires 2 for 38'' deck; hi-lift blade 
Lenght 19 1/2'' (495.3mm)
Centre Hole 11/16'' (17.5mm)
Width 3'' (76.2mm)
Thickness .203'' (5.2mm)