Sizes range from from 6 feet 7 inches to 10 feet 7 inches. Choice of blades. Solid or cutout spherical blades are available to match your disking conditions and needs. See your John Deere dealer for advice. Gang bolts are 1-inch round for strength that holds up in tough conditions.
Tapered blades smooth out the soil.
Progressively smaller blades on the outside rear gangs reduce ridges and blend one pass into the previous one. And you can add optional furrow fillers to further feather the soil. Match weight per blade to your conditions and power. A 620 Integral Disk offers from 30 to 38 pounds per blade. Ideal for your tractors with 60 horsepower or less.