Oregon Gator Mulcher (3pack) 3-N-1 Blade For 60-Inch Z Trac Models 7-Iron Decks John Deere Lawn Mowers 96-730 3 Pack Oregon 96-730 Blades For 60-Inch Z Trac Models 7-Iron Decks Replaces OEM No. M128485, and M144196 Blade Length (Measured Diagonally): 21in. Center Hole Diameter: 29/32in.