Was a bit fiddly to fit initially (second one was easier than first) but when fitted is great product and good quality. I have several types of code locks fitted at my home and they are all work very well, but these units are ideal for internal cupboards and doors as they are just that bit neater, just make sure you read the instructions well and use the paper template before cutting any holes and what ever you do don't shut the door before you have checked it is working properly !!!!!