It sounds like you are looking for a locking hitch pin to secure your ball mount to your vehicles trailer hitch receiver.
I recommend the etrailer Trailer Hitch Receiver Lock for 1-1/4" Hitches - Flush - 2-1/8" Span - Chrome # e98879 if your vehicle has a 1-1/4" trailer hitch receiver, or the # e98880 if you have a 2" trailer hitch receiver. If you are not sure which size your trailer hitch receiver is you can measure the inside length of the coupler to determine which hitch is installed... view full answer...
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