Right out of the package I was surely going to be disappointed because I only received 3 instead of the advertised 4. The good news is that I only needed 3 and although this is a slightly different design than the original it was easy to install. Now my RV storage compartments use a different key than everyone else's. Our motor home is only 3 months old but one of the original locks was already wearing out and was difficult to lock and unlock.
If you own an RV your storage compartments more than likely use the same key as the majority of the RV's you see, meaning that your secure storage is not that secure. Newer RV's use a different key/lock than previous years but the same condition exists, just with a different key.