In which there is a screw hole.

[hoveringsombrero]

So, my ikea heart lamp, I want to finally use it, just am never sure when at the store what bulb to get.
I just noticed there's some info on the backplate.

It says 25WATT 120V type B (picture of a candelabra type bulb) lamp.

Doesn't say what the size of the base is.
I THINK it's an "E12 Candleabra Screw ( 12mm diameter )"

I can't tell if this looks like a 12mm diameter:



Fingers in picture for an attempted reference, remember, I has small handses.

Edit Measured diameter with the cm side of a tape measure, converted to mm, yup 12mm diameter!