Porcelain E14 lamp holder, including cable clamp.
Height: 60 mm.
Diameter: 30 mm.
Connector: E14.
Cable clamp material: thermoplastic.
This lamp holder has a safety device that prevents it from being unscrewed after installation (to protect you from electric shock when replacing the bulb).
Therefore, if it needs to be unscrewed, the safety system located in the base must be released with a screwdriver.