The IRC Q13-137 Volume Control is a replacement potentiometer component manufactured by International Resistance Company (IRC) for vintage electronic repair and radio restoration. Rated at 1.0 megohm (1 000 000 ohms), this control features a base measuring 15/16 inches in diameter and a 2-3/4 inch shaft length. Equipped with IRC's standard Knobmaster fixed shaft, the configuration features a 1/2 round profile with a 1/4 inch flat inside diameter designed to accommodate over 90% of replacement knob requirements.