This black / silver button has a diameter of 33mm. The knob fits perfectly on a standard potentiometer, which not only improves the grip, but also looks a lot nicer. https://elecena.pl/product/27738532/opencircuit-potmeter-knob-black-silver-33mm 2025-01-22 https://elecena.pl/product/27738532/opencircuit-potmeter-knob-black-silver-33mm 2025-02-15 https://elecena.pl/product/27738532/opencircuit-potmeter-knob-black-silver-33mm 2025-02-17 https://elecena.pl/product/27738532/opencircuit-potmeter-knob-black-silver-33mm 2026-02-20