ITEM NAME:E27 Wall plug-in Screw Base Round Light Bulb Lamp Socket Holder Adaptor M&O Features: Products with flame retardant, high temperature resistance, impact resistance, good electrical performance, low resistance, high safety performance, is your best choice! Specifications: Material: Bakelite,The wiring column is made of copper and gold Rated voltage: 111V- 240V Package Included:.1x E27 Screw Lamp Holder Convert To With Socke Switch Lamp Socket. impact resistance, good electrical performance, low resistance. Material: Bakelite,The wiring column is made of copper and gold. high safety performance, is your best choice!