Spider Duplex Adaptor UK - BC / B22 or SES / E14
29mm diameter hole and a 140mm overall diameter/reach
This spider can be used to hang a lampshade which has a duplex fitting (like a ring inside the shade, at the top). First attach it to the Bayonet Lampholder on the ceiling pendant. Then, rest the shade on the top of it.
Before starting any electrical work, always switch off at the mains. If in doubt consult a competent electrician