Peephole opener are an ideal addition to existing lock-off tool sets. Locksmiths in particular like to use our ZIEH-FIX® "Lock-Off" peephole opener to open apartment entrance doors or double rebate doors non-destructively. Thanks to various tools, the existing door peephole can be removed before using the door peephole opener. The door can then be opened with the help of the peephole. If there is no peephole, you can simply drill a hole with a wooden drill bit. After successful emergency opening, a new peephole can be inserted.