fluorescent lamp holder: 1.E14/E27/B22 lamp holder/lamp cap 2.Made of Aluminum,Ferrum,copper 3.Torque test 4.SKD experience Fluorescent lamp holder:We are CFL manufacturer for many years, for now we are supplying SKD raw materials to our customers, such as lamp holder, plastic cap, tube, electronic ballast,etc. If you need, let me know your idea, we can support you. Aluminum copper lamp holder