4-PACK E26/E27 to E39/E40 Adapter/Converter, Convert E26/27 Medium Screw Base to E39/E40 Mogul Base Socket, Fits Halogen/LED/CFL Light Bulbs, Heat-resistant, Anti-burning, Max 250V, 1000W Enlarge the light bulb socket, quick and easily convert US standard E26/E27 medium screw socket to E40 screw socket Compact size and light weight, widely fit for E26/E27 socket lighting fixtures and E40 base LED/halogen/CFL light bulbs Easy to install and use, just screwing into existing E26/E27 socket, looks like a part of the socket, generally used in antique floor lamp and high power HPS HID Save you a lot of trouble and money of replacing your original lighting fixtures Durable anti-burning material, high temperature resistant & erosion-resistant, no fire hazard, suitable for Max 250V, 4A, 1000W