Product Details: Get your semi truck's wheels Ready for the Road Ahead™ with enhanced protection against dust, debris, and oil, with the Stemco Sentinel® ESP Hub Cap Plug. 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. Built with sturdy metals and a simplified design for an easy-to-install or remove procedure. FleetPride is your First Click in Heavy Duty®.