This listing is for

1 Blade
21" Length 
5/8" Center Hole
.240" Thickness

Heavy Duty, Notched Lift, Commercial Blade

Replaces: 

This is a single replacement blade
If you need a full set of blades for a 42" Deck, please purchase a QTY of 2. 
If you need a full set of blades for a 60/61" Deck, please purchase a QTY of 3 

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