Hanpearl Round E27 White LED Lamp Screw Base Halogen Bulb Holder Converter Light Bulb Base Lamp Socket Adapter (10 pcs) Product Dimensions: (4 x 7.8)cm (H x Dia.) Easy and convenient for you to install and use. E27 lamp holder for E27 screw type light bulbs. It has a long lifespan, and is unaffected by cycling on and off. It can also be mounted under eaves or on walls to brightly illuminate driveways, yards, docks or landscape.