Black plastic knob in a Boss style. 19mm outside diameter.
NOTE: Will fit the round shaft, vertical-mount pots but are VERY tight on them. They need a lot of shoving.
They aren't very deep, so you'll need to cut your pot shafts shorter. Because of this we can't offer builds finished with these knobs.
Pot shaft size: 6mm
Fitting: Set screw
Price is per knob.