Rigid Hitch Trailer Hub Kit (BT-150-22-A) 5 Bolt on 4-1/2 Inch Circle - 1-1/16 inch I.D. Bearings Fits up to 2,200 lb axles with a 1-1/16 straight spindle and has a 1.50 seal surface diameter Complete assembly with bearings, seal, dust cap, cotter pin and lug nuts Measures 4-1/4 inches tall (through center of hub) 2,200 lb capacity - 1/2-20 thread - 5 bolt on 4-1/2 inch bolt circle Read product description below for more information