John Deere OEM Replacement Blade 330-595
FITS MODELS: ZTrak M653, M655, M657, M657A, F620, F680, F687, 737, 757 and Z655
Requires 3 for 54'' deck; medium-lift blade 
Length 19'' (482.6mm)
Centre Hole 29/32'' (23mm)
Width 2 1/2'' (63.5mm)
Thickness .250'' (6.4mm)