This listing is for one cast steel rotary cutter tailwheel hub with industry standard four (4) bolt mounting and with tapered roller bearings and seals for a 3/4" axle bolt. This tailwheel hub is used my most manufacturers on their heavy duty 3-pt hitch rotary cutters but they also make a great replacement on lighter cutters offering much longer life. Designed to fit most 15" diameter and 21" diameter tailwheels with 4 bolt mounting , 5" bolt circle and 5-1/4" hub width they come complete with all bearings, seals, centering bushings and mounting bolts, axle bolt not included. Specifications 4 Bolt on 5" Centers Sized for 3/4" Axle Bolt (Not Included) 5-1/4" Hub Width Grease Fitting Replaceable Tapered Roller Bearings Replaceable grease seals to keep bearings clean and dry 1/2" Mounting Bolts Included We sell many replacement rotary cutter parts. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Replaces Part Numbers:CHRB161 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.