1. Using in salt water since it is stainless steel and therefore will not rust.
2. Measures 1.980 inches at its base.
3. It is designed to be used in most 4 and 5 bolt hubs. Bearing buddys put a small amount internal pressure in the hub (about 3psi).
4. Function: Reduce the failure of the wheel bearing of the marine trailer, prolong the life of the bearing and prevent water and dirt from entering the hub and bearing
5. Material: stainless steel