Product details:

This Fenchel Shades lamp shade has a top diameter of 14 inches, a bottom diameter of 15 inches, and a slant height of 15 inches. The vertical height of this shade is about 14.99 inches This attachment is called a washer attachment and is brass in color. It is also known as a spider attachment. If your lamp has a harp, then you will generally need a washer attachment. The hole size (inner-dimension) of a washer attachment measures slightly under 1/2 inch.