In case you have not picked this up already from the numerous reviews: DON'T BUY THIS LOCK ... I can think of few instances where using all caps is appropriate, but this is one. As others have noted already: The lock itself is solid enough, but the base of the lock cracked apart after a few months, and the whole thing rusts quickly, even if your bike is only very occasionally caught in passing rain (I store my bike inside my house). The key can sometimes get stuck, and it sounds like it gets permanently stuck for some. And the notches on the lock are not beveled at the corners so its very easy to ding your frame and chip the paint. The mount for the frame is cheap and locks onto your frame permanently with a ratcheting mechanism, and is a pain to take the lock on and off of.In short, PLEASE PLEASE PLEASE learn from others mistakes, and spend the few extra dollars to buy a product from another manufacturer. You really will be happier with a different lock