This locking pin does exactly what it's supposed to.  It's a little tricky to get it locked the first time because it doesn't self lock when you insert the pin into the locking end; you need to lock it with the key.  The rusting of the pin inside the locking end concerns me a little, but we have a short tow season here, so it will only be in use for probably no more than 6 months at a time (I bought a locking pin basically so I can leave the ball mount installed).  Those that would install it and forget it may want to rethink that plan.  It may not fit all receivers (as evidenced by the reviews), but it fit mine, with a with little to spare.  2014 Nissan Frontier equipped from the factory with class IV 2" receiver.