None 12 in. Top Diameter x 12 in. Height x 13 in. Bottom Diameter Fabric Linen Cream Empire indoor 0.5 in. Washer

This Fenchel Shades lamp shade has a top diameter of 12 in., a bottom diameter of 13 in. and a slant height of 12 in. 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 inner-dimension of a washer attachment measures slightly over 1/2 in.