This rotary knob is made of durable plastic with a 6mm metal shaft and a built-in screw for easy adjustment. It's perfect for connecting to rotary potentiometers, especially multi-turn linear potentiometers often used as volume control switches. The grooved handle design ensures comfortable operation. Easily mount this plastic control knob to a potentiometer for smoother rotation. Control volume easily with clockwise and counter-clockwise rotation. Ideal replacement part for audio equipment; the 6mm shaft easily fits the 180-degree rotary knob for simple potentiometer control. Specifications: Material: Plastic, Metal Color: Black Suitable for shaft hole diameter: 6mm / 0.24 inches Knob top diameter: 27mm / 1.06 inches Height: 16mm / 0.63 inches Rotation Angle: 180 degrees Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.