Medium Base, On-Off Turn-Knob, Phenolic Socket, with Threaded Shell and Ring (47684)

Features: Regular on-off function, turn-knob, phenolic socket The shell comes threaded and includes a shade ring Medium base (E26), sometimes referred to as standard or Edison base The bottom cap it tapped 1/8 IP, which measures 3/8" diameter The bottom cap also comes with a set screw for a more secure fit Rated 250 watts - 250 volts U.L. and CSA Listed Turn-Knob On/Off Phenolic Socket, Med. Base (E26), 1/8IP cap, has threaded shell with ring, 250W- 250V, 4-piece set, with screw terminals.