Miracle LED 604831 U.L. Listed Premium Socket Extenders for LED CFL and Incandescent light bulbs, 6 Pack (Three 2-Packs) Plastic Premium Porcelain Construction Stackable at 1" intervals. U.L. Listed. Fits all E26/E27 Medium Base Bulbs Brings shorter bulbs out to the level you require. Save BIG with this multi-pack!