Tamper-resistant pintle hitch locks are designed to prevent theft of trailers with a pintle hitch and lunette ring coupling system. It secures the lunette ring, preventing access from a vehicle hitch. These locks are designed to fit most forged Pintle Hitch Lunette Ring couplers. Tamper-proof from hammering, prying, and resistant to sawing and grinding. All components are interlocked, eliminating loose parts that require assembly each time you install or remove the lock from the coupler. This feature makes installing and removing the lock quick and easy, requiring only one hand!