These insulators are way bigger than needed for the 120 volts that they will be insulating...but we must over-insulate over here on the coast for salt air contamination leading to leakage ;) On the left there is a Fred Locke CD 319 "space ship", (center) a Corning Pyrex CD 323 carnival glass and a CD 383 L'Electro Verre glass multipart from France. Dazzling!