FenchelShades.com Lampshade 11" Top Diameter x 17" Bottom Diameter x 13" Slant Height with Washer (Spider) Attachment. For Use on Lamps with Harps (Cream) Top diameter : 11" Bottom diameter : 17" Slant height : 13" Washer fitter, " drop, designed for lamps with a harp Custom made to order - Made in USA