its a 230V 16A outlet, and if not RCD protected that metal could get quite hot with a short circuit before it opens the breaker
(one of many European drinking songs celebrating the work of the Fire Brigade)
@Barkingdogproblem @VeroniqueB99
It will get voltage to the cable. It will not convert the voltage between 110 and 220.
(Of course it will also be a shock and fire danger to everyone in the building and you should wear electrically safe gloves to construct it, but it will get voltage to the wires as shown.)
Edit: another safety concern. this may reverse polarity which won't matter for some things but could mean heating elements in hair dryers and toasters for example may have live voltage on them instead of being connected to a neutral line when powered off.
WTF
HONESTLY WHY IS IT THAT EVERY TIME I OPEN THIS APP I GET IMAGERY LIKE THIS THAT MAKES EVERY HERTZ HURT
I’m being slightly hyperbolic.
…but as someone who is nominally a sparky, not by much.

Considering the keychain ring .... It might even work like a fuse ... So clever design ....??!?
Most equipment I've seen the last 20+ years handles 100-240v without needing to "flip" a voltage level switch. Older equipment often had a such a switch too.
But I'm seeing that from a European perspective. I've only heard about the need for a voltage level convertor on some very old equipment back in the late 80s. All the travelling plug-converters easily available today are just passing through the voltage level.