Brass Gallery with a 28mm center hole and 3 screws.
This has a 28mm hole in the center which you can simply add a BC lampholder to and clamp it in place with its shade ring.
Has 6 Decorative hole in top for head ventilation.
And has 3 screws to hold the shade in place, these can be done up with a slotted screw driver if needed.
Center hole size: 28mm
Outer diameter: 85.5mm
Inner diameter: 83.5mm approx
Please note that the inner diameter is the max outer diameter of the item you want to fix to this gallery.