Jazz bass style knobs (imperial knurled shaft size)

Plastic knobs with white line indicating the position the potentiometer is in throughout it's sweep. The small knob is typically found in the bottom position on the tone control - next to the output jack, the large ones are typically for each of the pickup volumes.

For knurled shaft potentiometers with 24 splines (CTS, etc).

Dimensions -
Small -
Diameter (top): 16mm
Diameter (bottom): 20mm
Height: 10.5mm