2 Packs Ali Tronics E39 to E26 Adapter (Mogul Base E39 to Medium Base E26), UL Listed,Ceramic Material-high Voltage and High Temperature Resistant Transfer your lamp with E26 medium base to mogul base E39 Ceramic material,high temperature and high voltage resistant Up to 660 Watts MAX Up to 250 Volts MAX UL listed product,UL number - E328750