I provide two universal knobs which can be assembled on a standard 6mm axel of a potentiometer or mutli-stage switch.

The knob can be fixed tightly with an M3 screw.

For assembly, you'll need an M3 nut and an M3x10mm screw,

The knobs have a diameter of 28mm respectively 33mm at the base and a height of 16mm.

For more dimensional detail refer to the technical drawing which you can find the things listing (DRW_universal_knob_4642551.PDF).