CE Smith 1-3/8" - 1-1/16" Tapered Spindle Trailer Hub Kit The CE Smith Trailer Hub Kit is designed with pre-greased bearings. cutting down on the mess by producing a final installation onto the axle. The hub kit is made of a galvanized material making it durable in marine environments. The kit includes a dust cap, cotter pin, and lug nuts.Specifications: 6 stud x 5-1/2" bolt circle diameter; 1-3/8" tapered to 1-1/16" shaft; 1750 lb capacity; 16" maximum wheel size; 1.98" hub inner diameter; 6-3/4" wheel flange diameter; Features: Dust cap; Cotter pin; Lug nuts;