7-INCH TRIPOD FOR CENTER DRAFT BURNER: This tripod supports a shade having a 7-inch bottom diameter and snaps over a CENTER draft burner, such as Rayo, Royal, Bradley & Hubbard, E. MILLER and other "Gone-with-the-Wind" (GWTW) style lamps. The arms are brass plated steel. The center ring is solid brass (2-13/16 inch inside diameter).