Product description:
This is a good bearing partner used in salt water, because it is stainless steel, so it will not rust.
The bottom of the bearing partner is 2.441 inches. It is designed for most 4 and 5 bolt hubs, and the bearing partner applies a small amount of internal pressure (approximately 3 psi) in the hub.
When the hub is immersed in water, water cannot enter the hub due to the pressure. This is a good way to extend the life of the bearing and perform bearing repairs between repackaging the hub.
The help of bearing friends can prevent dust and water from entering the hub and bearing.
The blue indicator ring will stretch out to let you know when the bearing partner is full, or sink back to inform you that you need to add grease.

Features:
Material: Stainless steel
Packing size:  as picture show

The package includes:
4 x Stainless Steel Boat Trailer Bearing
4 x Silicone protective sleeve

Note:
No installation guides are included, we highly recommend to seek professional installation. 
Will come with everything you see in the picture. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)
Please check that the picture matches before purchase. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.
For any inquiries or special requests such as larger amount ordering please write to us.