orlich 2 Packs E39 to E26 Adapter (Mogul Base E39 to Medium Base E26), UL Listed,Ceramic Material-high Voltage and High Temperature Resistant
If the lamp is medium base E26/E27,but your socket is mogul base E39/E40. And you dont' want to buy the new E39/E40 lamp, you can used this adapter to match the socket. It's easy to transfter it and save your cost.