ITEM NAME:1x 40*17mm Volume Control Potentiometer Control Volume Knobs Rotary Encoder gN Description Color: Black Knob Diameter: 40mm(1.57Inch) Knob Height: 17mm(0.67Inch) Installation Hole Diameter: 6mm(0.24inch) Suitable For: 5.9-6mm shaft diameter potentiometer Material: Aluminium alloy&Plastic.Include 1pc. Material: Aluminium alloy&Plastic.