Does anyone know what this is for?

It’s a doorstop I think.

To stop the door from banging into the wall when it opens

Door stop. Stops handle cracking the tiles .

It’s the end of a Dalek eye piece stuck halfway through the wall as the result of their own failed Philadelphia experiment 😋

Door bumper!!

Glory hole.

It's for men to measure their penises. If the peen can fit inside that thingy, it's small enough to qualify for anal with another man without it being gay.

If it's high up it could be for a shower curtain pole?

Panic button

Only use it if the paper is gone

Its for the door so it doesnt hit the wall.

That's an Android charging port

To make people ask questions

is it to fix a washing line into
theres usually one on the other side too if it is

Keep the door knob from breaking the tile

It's a sex toy holder

knob polisher.

Peep hole