1.E27 lamp holder to E series lamp holders, which can be directly screwing in lam cap 2.durable product ,bakelite ,coppe 1E27 .lampholder2.durable product ,bakelite ,copper conductor3.good design,high quality and long usage life.4.easy installation,Simple Operation.5.outer packing :600pcs/ctns 6.Material plate bakelite wire copper7.Have gained CCC ,CE,ISO9001 certification