Product Details: Prepare your semi truck's wheels to be Ready for the Road Ahead™, with the Stemco 342 Series Grease 6-Bolt Hub Cap that offers enhanced protection against dust, debris, and oil. By attaching to the external frame of a wheel, this removable hub cap protects the lug nuts, bolts, and axles from harmful roadside materials. Constructed with sturdy metals and a streamlined design for an easy-to-install or remove process. FleetPride is your First Click in Heavy Duty®.