In the castle is a very solid lock. Just the appearance scares since. This combined with an alarm function should have been enough deterrent to the thief. I use the lock to fix something locally, so the weight is no problem for me. For bike to take away but it would be too heavy for me, is thus probably more something for the moped .... It does what it is intended, two things I like but not as good. There is a short but loud beep when closing the lock (the neighbors rejoice at night ..... sure), insert the key, I find something Hoe Ling, as you possibly, thinking man is quite with the key in the lock but it is then but not yet and thus can also turn nothing.