[nindwen]

Does anyone know how widely these are actually used?

When looking at the video, the key looked very "old fashioned", and I thought that surely they're not widely used anymore. In Finland, most locks are something called (after quick look to Wikipedia) disc tumbler lock, and I hadn't really thought about how common they're elsewhere.

They look like these http://www.bobi.com/assets/Products/Bobi-mailboxes/accessori...