Ensure your semi truck's wheels are outfitted with components with Expertise Built In , with the OTR 6-Hole Aluminum Hub Cap with Side Plug, a product that protects against oil, dust, and debris. To prevent damage to a wheel's lug nuts, bolts, and axles, this removable hub cap attaches to the frame to guard against roadside materials. Fashioned with durable metals and an ergonomic design for an easy-to-install or remove process. FleetPride is your First Click in Heavy Duty .