Window restrictor, to limit opening (e.g., for safety) (Corstorphine EH12)

We got more than we needed of these, when we were concerned about our toddler opening low windows and climbing out. You need a drill and screws to fix them to your window frame. They have a key so you can remove the restriction temporarily, e.g., for cleaning, or in case you need to use them as a fire escape, etc. Dark brown.