Specification: Rated voltage: 220-230V Total Size: About 83x47mm (H x W) Material: Metal & heat resistant PBT Plastic Features: 27mm screw to 40mm screw. For allowing adaptation of light fittings & sockets to use other bulb types. Use this bulb socket adapter to convert E27 bulb socket to E40 bulb socket. Package Included: 1x E27 to E40 Adapter