John Deere OEM Replacement Blade 330-318 
FITS MODELS: 145, 155C, LA130, LA140, LA145, LA155, LA165, D140, D150, D160, X140 and X165 tractors with 48'' decks
Mulching blade 
Length 17'' (431.8mm)
Centre Hole 7 pt. star 
Width 2 3/4'' (69.6mm)
Thickness .164'' (4.2mm)