Our lamp holder is made of high quality PBT material, heat aging resistant, good insulator, durable and sturdy. E27 to E27. The socket type is E27, so it is compatible with the standard E27 bulb. The direction of each socket can be adjusted, you can adjust them to any direction you want. < p>A must have for anyone who needs to convert a dull, dim place to one that shines with light and brightness. Suitable for use with fluorescent bulbs in photography, home or somewhere else.