A set of four small markers that sit under a speed or top hat knob to indicate the position of the pot by pointing towards the numbers on the knob. These are simply installed under the washer and nut of the potentiometer and secured by them on top.
Dimensions:Length: 21.5mm
Length (from center of hole to pointer): 14mm
Width: 15mm
Diameter of hole: 9.5mm
Pointer height: 5mm