Acme Heavy-Duty 1/2" Hitch Pin & Lock
This Heavy-Duty 1/2" Hitch Pin & Lock can be used in place of hitch pins. This solid steel, zinc-plated pin is used as a safety device when towing and also prevents theft. A vinyl cover protects the key hole. It comes with two keys.
Also available in a 5/8" Hitch Pin & Lock (#380924, sold separately).