I am surprised by other reviews. I like these door stoppers and am buying more. I'm sure they could be broken if used on a very deep door, but for all the doors in my house they fit well. I like these over another brand I bought because they are can be removed temporarily if not required (eg. at night when my baby is in bed and I want to keep noise and heat in my lounge), unlike some which require permanent fitting to the door or adjacent wall. They are also instantly fitted to, or removed from, doors with one hand (convenient if you have a baby in the other).