Features 1. Designed for use with most 4 and 5 bolt hubs 2. Helps reduce marine trailer wheel bearing failure and extends bearing life by preventing water and dirt from entering the hub and bearings 3. Constructed from high-quality stainless steel for corrosion resistance and durability 4. Features automatic pressure relief; grease can be added through an easily accessible grease fitting located in the center of the piston 5. Lubricant level and pressure can be quickly checked by pressing the edge of the movable piston Specification Condition: Item Type: Hub Bearing Kit Material: Stainless Steel Color: As shown in picture Application: Suitable for boat and trailer hubs Package List 4 x Bearing 4 x Cover