Worst thing I've ever bought.  I purchased the 1st one in January.  They replaced it in February, because the "C" clip that grabs the shaft would not open to allow the lock to slip onto the its shaft.  I worked OK the next couple of times. Then, it got to where you had to really work the lock to get the C clip to let go of the shaft, so that you could remove the lock. This went on for 3-4 times.  Then, yesterday, I was going fishing and I could not get the key into the keyway no matter what I tried.  After about 15 minutes, I had to get a bolt cutter and cut the lock, which I might add, was quite easy to do.  I bought a new boat in January and I've taken the lock off/on maybe 12 times.