This is a large UK made, unusual wire frame for making a pleated/gathered soft bodied lampshade.
Base diameter 14”
Slope height 14”
Top diameter  12”
this has a standard UKBC 29 mm fitting and is suitable for use with table or floor lamp.
Note that this is a vintage but unused frame and has been stored for awhile so has some grey scuff marks and may benefit from a light re-spray