Kubota OEM Replacement Blade 302-630
FITS MODELS: RC60B-21 
Requires 3 for 60'' deck; toothed blade 
Length 20 1/2'' (520.7mm)
Centre Hole 1 1/8'' (28.6mm)
Width 2 1/2'' (63.5mm)
Thickness .250'' (6.4mm)