Porcelain E27 lamp holder with cable clamp.
Height: 60 mm.
Diameter: 45 mm.
Connector: E27.
Cable clamp material: thermoplastic.
This lamp holder has a safety device that prevents it from being unscrewed after assembly (to protect you from electric shock when replacing the bulb). Therefore, if you need to unscrew it, you must use a screwdriver to release the safety system located in the base.