100 ohm Hum Balance potentiometer with 1/4" threaded brass bushing for mounting to amplifier chassis. Adjustable level control (using flat head screwdriver). Includes mounting nut and washer. Used as the hum balance control in '65 Twin Reverb® Machete™, and Vibrasonic amplifiers manufactured from 1992-Present. Like the bias pot for the '65 Twin, this one has a short 1/4" threaded brass bushing for mounting to the back chassis panel. Screwdriver adjusts from the front and the rear for easy servicing. Three solder lugs. CTS quality.