Aluminum Insert. Injection-molded cover fits into the 2" square hitch receiver hole. Secured with standard hitch pin (not included). Inserts as a plug in your pickup truck or RV receiver hitch. water, carwash and waterproof graphics UV protected, lasts for years; will not peel or crack Show your style with this trailer hitch plug insert. Great gift idea for family and friends Aluminum Insert. Injection-molded cover fits into the 2" square hitch receiver hole. Secured with standard hitch pin (not included).