Bronze Lamp Standard Length Keyless Sockets with Set Screw

Medium base (E26), sometimes referred to as Edison or standard base
Bottom cap is tapped 1/8 IP, which measures 3/8"
Bottom cap also has a set screw for a more secure fit

Lamp Keyless Lamp Socket – Keyless bronze finish bulb socket with oil rubbed bronze finish.
Shell for standard size bulbs, UL/CSA, Imported