Grasshopper OEM Replacement Blade 320-018
FITS MODELS: Duramax decks, 9861 and 3461
Requires 3 for 61'' deck; notched hi-lift blade 
Length 21'' (533.4mm)
Centre Hole 1/2'' (12.7mm)
Width 2 1/2'' (63.5mm)
Thickness .250'' (6.4mm)