Set of 5 Metal Shell Nickel Black Medium Base Incandescent Brass Vintage Light Socket Lamp Holder with Removable Turn Knob, Great For Industrial Vintage DIY Projects Set of 5 electrifier medium base copper shell lamp holder would help you to create your own design lamp or chandelier. UL listed metal shell lamp holder with E26 basic bulb base. With hard paper in the socket inner, seismic and impact resistance Safety locking screw in base for secure fitting. Also includes socket fixing top part