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Fits electric guitar, bass and other instruments equipped with dual concentric pots, for the most common concentric potentiometers
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The upper knob size: 19*13mm(3/4*33/64 inch), compatible with 6mm(15/64 inch) shaft pots
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The lower knob size: 25*10mm(63/64*25/64 inch), compatible with 8mm(5/16 inch) shaft pots
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Made of steel, stable and durable, brass made shaft hole, with set screws
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Package includes: 2pcs knobs and wrench