Product Details: Outfit your semi truck's wheels to be Ready for the Road Ahead™ with enhanced protection against dust, debris, and oil, with the Stemco Grease/Oil 6-Bolt Hub Cap. This removable hub cap covers a wheel's exterior, to prevent harmful roadside materials from causing damage to the lug nuts, bolts, and axles. Engineered with resilient metals and an ergonomic design for an easy-to-install or remove procedure. FleetPride is your First Click in Heavy Duty®.