Robond, the world's safest locking fuel caps! Make sure your fuel stays in your tank with these locking fuel caps. This fuel tank security system replaces the original fuel cap and features unique patented, finger press, locking mechanisms. The cap spins freely when locked, is theft, siphon and vandalism proof. Made of thick quality aluminum. 500,000 different key combinations. Nylon screw cap protects locking mechanism from weather conditions like water, salt and sand. Anti-drill center. Tether chain, crossbar and adaptor included. Fits all Peterbilt models. Sold as a pair.