Trailer Hub Kit - For 1-3/8" Inner / 1-1/16" Outer Tapered Spindle - 5 Bolt on 4-1/2" Bolt Circle Fits 3,500 lb. axles Complete assembly with bearings, seal, dust cap, cotter pin and lug nuts Capacity 1,750 lbs Thread 1/2"-20, 5 Bolt on 4-1/2" Bolt Circle Read product description below for more information