Ensure you get the right blades, look up the mower blades you need at https://partscatalog.deere.com/jdrc/. Or put the make, model and serial number of your piece of equipment in the comments when you order and we will check it before we ship the parts.
54-inch Standard Mower Blade for X700, Z500 and Z600 Series mowers with 54 inch High Capacity Mower decks.
Sold individually, purchase 3 for a full set. Blade length: 19.063 inches.