The UM Rotary Tiller is dependable, able to work demanding soils like vineyards or orchards. The UM series is suitable for tractors from 25 to 50 horsepower with a category 1 hitch. UM-72 Rotation: Forward RPM: 540 HP Required: 25-50 Working Width: 73" Max Working Depth: 7" Flanges on Rotor: 9 Tines per Flange: 6 Total Tines: 54 Rotor Diameter: 3" Rotor Swing Diameter: 17" Overall Width: 78" Hitch: Cat I