Guitar and Bass Speed Knobs - Imperial  24 Fine Spline

-  An imperial guitar speed knob is a specific size of the cylindrical speed knob designed to fit the potentiometers (or
    "pots") typically found on USA-made guitars, such as those from Gibson. The distinction between Imperial and Metric
    is crucial for compatibility: Imperial Size (USA Spec) are designed for pots with a 24 fine-spline (or fine-knurled) split
    shaft. Commonly associated with US-made brands like CTS, Fender, Bourns, or DiMarzio.