... waterproof lamp socket,lampholder,lampbase 2)main material:porcelain 3)fittings:copper,aluminu,zinc alloy 4)certificate waterproof lamp socket,lampholder,lampbase1) product name : lamp holder ... : 4A-16A;4) main material: high pressure & ceramic, common ceramic, porcelain;5) metal:copper, iron, aluminum,zinc alloy6) size:as your ...