Porcelain Lamp Holder Insulator Knife Swith, Fuse Holder Plastic Lamp Holder manufacturer / supplier in China, offering Wholesale Plastic E27-2e27 Interchangeable Adapter for LED Bulbs, E40- E27 Lamp Socket Converter – Screw Base Adapter for LED Bulbs, Wholesale E40-E27 Lamp Adapter - Connector for LED Bulbs (OEM Support) and so on.