Included: (1) dust caps
The dust cap attaches to the end of the hub assembly at the center of the wheel. It protects the inside of the hub from dust and water and keeps grease inside the hub. Rubber grommet/insert for easy access to grease fitting inside without needing to remove the whole dust cap.
Metric measurements and specific to the Sportstar III trailer model.
Inside Diameter: 45.8mm
Overall Height: 40.8mm
Other related items: bearing buddies, hub cap, and grease cap.