This is a quality scalloped lampshade frame with interesting eye shaped sections for making a  tailored soft bodied lampshade.
Base diameter 18”
Slope height 15 1/2”
Top diameter 9 1/2”
Duplex ring fitting to sit on a shade carrier. This isn’t included but I do sell them. I suggest an 8”. 
Please note that this is a vintage frame and has stored for many years. There are lots of grey scuffs et cetera to the white and paint but these would be covered by fabric.