As with most locks, it is hard to get the pieces lined up just right when installing them. The worst thing about this product is that the catch that is supposed to prevent your child from opening the cabinet a crack and then reslamming his/her fingers in there doesn't work. The catch almost never catches. In fact the only time it catches is when an adult forgets about the cabinet lock and tries to open the cabinet with an adult's normal force. Then it catches. And it is difficult to unhitch. I could go on about the other design defects about this product, but I don't want to waste my time. I recommend buying one of the cabinet locks with a little joint and spring in there.