UMAX 50 Coupler Lock
All in one--locks itself! Nothing extra to buy.
The UMAX 50 fits 1 7/8", 2" and 2 5/16" Couplers. It has a hardened 5/8" Steel Shackle. It has a dual ratchet locking systems, so you can fasten this lock as tight to your coupler as possible, and it won't come off. It has rugged tubular keys with key hole covers & a corrosion-resistant finish. Simply fits up inside your coupler to form a barrier where someone might insert a small ball to tow your otherwise locked trailer off. Great theft deterrent!