91-PC4M

4pin male microphone connector - It is a chassis or panel-mount receptacle commonly used in vintage audio equipment, CB radios, and ham radio transceivers -Type: 4-pin Male Panel Receptacle.
Construction: Chrome-plated machined brass shell with a black phenolic dielectric.
Electrical Ratings: Typically rated for 600V (RMS) and 5 Amps.
Mounting: Designed for a 27/32" diameter mounting hole on panels up to 1/8" thick.