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E12 ceramic light fixture bindding screw specification:
Material: copper/iron/aluminium
1)ceramic light fixture E12, lamp base
2)UL, VDE, CE
3)cheap price with good quality
4)fittings:copper, aluminum,iron or zinc alloy
 
E12 ceramic light fixture Candelabra (US), 12mm diameter, typically found on night light bulbs, chandelier bulbs,
The metal screw itself forms one of the contacts for the circuit. If the lighting system is not correctly wired, or a lamp is plugged into a non-polarized outlet, the metal screw can become energized, presenting an electric shock hazard to anyone attempting to change the lamp.
Screw ceramic light fixtures are more suitable for small size bulbs
A bulb fully screwed home is more secure than a bayonet fit bulb
Moisture and debris is less likely to contaminate the contacts of a screw base bulb