The UFP trailer idler hub features a 5-lug, 5 on 4.5" bolt pattern (bearings, seal, lug nuts, cotter pin, and stainless steel trailer buddy sold separately). It is zinc-plated to provide excellent corrosion resistance. This hub fits standard 1 3/4" x 1 3/4" straight spindles designed for 4,200 lb axles, using L68149 inner and outer bearings (not included).