Porcelain Lamp Holder Insulator Knife Swith, Fuse Holder Plastic Lamp Holder manufacturer / supplier in China, offering Heat-Resistant Plastic G5.3-GU10 Interchangeable Lamp Socket Adapter, E14 -GU10 Plastic Lamp Holder Adapter Converter Lamp Holder Socket, Wholesale Plastic B22 to E27 Bulb Base Converter Socket Adapter and so on.