Genuine OEM Toro part
Secures the blade on the drive shaft to allow for rotation without it falling off during operation of the unit
1/2-20 X 2-1/4
Fits Toro mower models but not limited to:
30555, 30564, 30575, 30450, 30455, 30569, 30716, 30568, 74212, 74209, 74183, 74181, 74218, 74219, 74315, 74313, 74312, 74311, 74319, 74318, 74316, 74314