CE Smith Trailer Hib Kit 1-3/8" To 1-1/16" Studded/Boxed. Hub comes fully assembled with pre-greased bearings, which cuts down on the mess and makes final installation onto the axle much easier. Includes carry case, dust cap, cotter pin and lug nuts. 5 stud x 4.5" bolt circle dia. 1-3/8" tapered to 1-1/16" shaft. 1750 lb capacity. 6-1/2" wheel flange dia. 15" maximum wheel size. 1.98" hub inner dia.