Kubota OEM Replacement Blade 330-821
FITS MODELS: GR, ZG and ZD series
Requires 3 for 48'' deck; standard blade 
Length 16 1/2'' (419.1mm)
Centre Hole 11/16'' (17.5mm)
Width 2 1/2'' (63.5mm)
Thickness .250'' (6.4mm)