Product Details: The SKF 6-Bolt Tamper-Proof Hub Cap is designed to provide superior protection for your vehicle. Its outer diameter of 6.20" ensures a secure fit, while an embedded aluminum ring evenly distributes the load. The molded pressure ridge improves the sealing ability, and the proven center-fill vented plug-in design ensures a tight seal. The side fill plug incorporates an O-ring for extra leak protection and a magnet which traps metallic particles. The patented umbrella style valve seals keep out contaminants, making this hub cap ideal for Ford, Volvo, Mack, and Freightliner applications. FleetPride is your First Click in Heavy Duty®.