This 2-pack of Uriah Products bearing protectors will help keep your trailer's wheel bearing assemblies clean and running smoothly. They have an outer diameter of 1.986" and will fit any hub that requires that size cap. They have a grease fitting that allows you to lubricate the spindles without removing the caps while protecting the spindle bearings from seizing from contamination. These caps are especially useful on boat trailers that are occasionally submerged in water. | Uriah Bearing Protectors 2 Pack