This item is a new replacement heavy duty tail wheel hub with bearings and seals and the axle bolt included. This hub will fit all 4 bolt rims on any make rotary cutter that uses a 3/4" axle bolt. 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 **Tapered bearings & bushings & seals **3/4" x 8" Axle bolt included This is a serious hub and comes standard on many heavy duty mowers.