John Deere OEM Replacement Blade 330-587
FITS MODELS: 1400 and 1500 series front mounts ZTrak 667-797, 2820A-2840, Z820A; and 3120-4410 to compact utility tractors
Requires 3 for 60'' deck; mulching blade 
Length 21'' (22.2mm)
Centre Hole 7/8'' (22.2mm)
Width 2 1/2'' (63.5mm)
Thickness .250'' (6.4mm)