Premium Value 10 Pack BC Bayonet Light Fitting To Medium Base Light Bulb Socket Converter Changer Switcher Adapter B22 Twist EU AU Cap to North American US CA E26 E27 Convenient Installation Free Unit Fireproof thermo-plastic with copper thread fits any standard edison E26 bulb in any voltage Easy installation , complete plug and play Use edison medium base bulbs for BC bayonet large cap b22 socket