SST18 Spin Steer Tractor John Deere lawn mower blades are manufactured with a combination of carbon and boron to provide hardness for a long life and sharp edge without breakage.

this set of mulching blades from 8Ten might be the perfect upgrade. These blades are designed to fit 48-inch decks from such manufacturers as Gravely, Scag, Hustler, Toro, and John Deere.