Product Details: The SKF 6-Bolt Tamper-Proof Hub Cap is designed to provide superior protection for your wheel hub. The embedded aluminum ring evenly distributes the load, while the molded pressure ridge improves the sealing ability. The proven center-fill vented plug-in design ensures a secure fit, while 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, providing superior protection for your wheel hub. FleetPride is your First Click in Heavy Duty®.