Very common replacement blade on mowers by Great Dane, Hustler, Lesco, Scag, and Wright.
Gator G3 Blade
Length: 16-1/2"
Center Hole: 5/8"
Width: 2.5"
Thickness: 0.203"
Air Lift: 1-1/4"
You will need to order multiple blades depending on your mower deck size.