FRANK MARTIN RV Trailer 1 1/8'' Combi-Cam Lock- Black Lock Cylinder

They are very solid, well-built locks. The mechanism feels very smooth, and the numbers are easy to read. It is a good size, fits in your hand and is easy to grip. These are SO much easier to lock and unlock then the flimsy junk that comes on RVs these days. No need for a key, just remember a 3 digit number, so easy to change the number too, but don't worry, other people can't change the number because you have to know the combination to unlock it, BEFORE you can change the combination to something else. Took me about 4 minutes to remove the old lock, install one of these and change the combination to something I can remember. I scrambled the number before taking the photo.