Equip your semi truck's wheels with enhanced protection against dust, oil, and debris, with the OTR 6-Hole Aluminum Front Hub Cap with Side Plug with Expertise Built In. By attaching to the external frame of a wheel, this removable hub cap protects the lug nuts, bolts, and axles from harmful 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.