Reliable Trailer Hub (Shorty) for 1 Inch OR 1-1/16 Inch Straight Spindles (BT-150A-02) Please note: This hub is a short hub 3-1/2" tall (through center of hub) Fits 2,000 lb. axles with 1 Inch OR 1-1/16 Inch straight spindles Thread 1/2"-20 - Hub comes equipped with pressed in races 5 Bolt on 4-1/2" bolt circle Read product description below for more information