Onite 2PCS E39 to E26 Light Bulb Adapter for Antique Floor Lamp Mogul Socket, (Compatible with E40 to E27), Change Out The"Guts" from The Current Mogul Base to Medium Base METERIAL: Construction is no frills, but solid, made of metal and fireproof ceramic (unlike some cheap adapters made out of cardboard and bakelite). The heat resistant is up to 200 degree. TECHNICAL SIDE: the "Mogul" socket is also called an E39 socket. The typical American 110V incandescent bulb has an Edison E26 base (often labeled "Standard Size" in America) and thus screws into an E26 socket. Have a lot of very old lamps around the church that use the mogul-style bulbs and since those bulbs are hard to find and expensive,to use these so you can use normal bulbs. MAX WATTAGE: 660 Watts max wattage, Voltage is 250V, allows you to use high wattage light bulb. The adapter will not convert the voltage. If you have 110V, it will stay 110V. Likewise, 220V will not change. This adapter is for physical dimensions only. EASY TO INSTALL: The bulbs fit into the adapters very easily and each one of ours fits securely. Doing this enabled us to replace the old CFL's we had with something that is non-toxic and uses less electricity. SATISFACTION GUARANTEED: 2-Pack. 100% satisfaction guaranteed. 60 days changing or refunding without reasons. Onite always stand back for its products, any issue of the product please don't hesitate to contact us.Attention!! Onite Products are sold and shipped by Onite. If you purchase a product from another seller, please request a refund as it is a counterfeit.