This is a brand new: Reese Towpower 74176 Wheel Bearing Protector 

Reese Towpower Wheel Bearing Protector safeguards and helps to keep out the elements and allows easy lubrication for a longer bearing life. This wheel bearing fits 1.781 inch wheel bearing hubs. 

- Keeps dirt and water from wheel bearings

- Permits easy lubrication for longer life

- Kit contains 2 bearing protectors and 2 covers

This spec. is only relevant for this item: Reese Towpower 74176 Wheel Bearing Protector