WWZMDiB 80 Pcs WH148 3Pin Potentiometers with Knobs 15mm Shaft Product includes - 20 Potentiometers, 20 Knobs, 20 nuts, 20 washers Axis length：15mm Number of Pins：3Pin Applicable to: audio equipment, power supply adjustment, measuring instruments, power control, etc., to achieve the adjustment and control of various circuit parameters.