Semi Truck Lock-On Guard Anti-Fuel Theft Device for Trucks w/ 3.5" Neck 2 keys are included with 1 fuel cap. Locks will be keyed alike in a set of 2 caps. Fits Freightliner (Also Sterling & Late Model Volvo) accommodates the 3.5 neck on the tank. Does not fit doorstep fuel tank models. Made from polished aluminum.