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Custom Amplifier Knob 25X15.5mm and 20*15.5mm Machined Aluminum Potentiometer Volume Control Knob, Find Details and Price about Knob Potentiometer Knob from Custom Amplifier Knob 25X15.5mm and 20*15.5mm Machined Aluminum Potentiometer Volume Control Knob - Dongguan Jindeng Metal Products Co., Ltd.