Bolt pattern: 5 on 4.5"; 1/2"-20 studs installed; bearing races installed; Kit also included: 4x L44649 outer cone bearings; 2 x Grease seals; 2 x E Z lube grease caps with rubber plugs; 10 cone wheel nuts 1/2"-20 thread ; Works on most 3500 lbs axles in the market; This hub has been wholesaling by large volume to trailer axle manufacturers