ITEM NAME:1 To 4 E27 Plastic Base Socket Light Lamp Bulb Head Description: This product is mainly used for studio and photography which can improve imaging brightness. It is a 4 in 1 photography E27 lamp socket splitter adapter for studio daylight bulbs. It can install 4 bulbs in one single socket at the same time. with it, you will enjoy more lights when you take photos or video, so if you want to upgrade your single socket bulb lights to 4 bulbs lights, this is the best choice. It is E27 base, the same as normal household bulb socket. Specification: Material: Plastic Size(L×W×H): 8 × 8 ×11cm/3.15 × 3.15 × 4.33inch Package Includes: 1 Piece 4 in 1 E27 Base Socket Adapter Holder Note: Please allow a slightly errors due to manual measurement. Thanks for your understanding. SKU: ALU0032883177001877.1 Piece 4 in 1 E27 Base Socket Adapter Holder. with it, you will enjoy more lights when you take photos or video, so if you want to upgrade your single socket bulb lights to 4 bulbs lights, this is the best choice.