B22 E27 E40 ceramic lampholder,porcelain lampholder 1.Type:ceramic lampholder 2.low price,good quality 3.lampholder socket 1. Type: Porcelain E27,E40,B222. Material: Copper/Iron/Aluminium/stain steel, according to customers' choice 3. Certificates : Meet CE/RoHS standard4. OEM/ODM are available ceramic lampholder