This item is a new replacement heavy duty cast iron tail wheel hub. This hub will fit all 4 bolt rims on any make rotary cutter that uses a 1" axle bolt. This is not the cheap thin fabricated hub that most sellers are selling online. This is twice the metal and made right! **3-1/2" center to center on bolt holes measuring clockwise and not straight across. **End of hub to end of hub where the bolt goes through is 5-1/4" wide **Greasable with replaceable knock in bushings