Zento Deals 2-Pack Trailer Hitch Receiver Lock Pin - Heavy Duty Anti-Theft Security Lock for Trucks, SUVs, RVs - Perfect for Towing, Camping & Outdoor Adventures

These two hitch pins come with four keys that fit. So I can keep one on my key chain and one with my spares and still have two more keys. I also like the rubber cap that keeps slush and dirt from entering the lock through the key hole, which would otherwise lead to rust.