500K Audio Taper, Split Shaft With Nut, Lock & Dress Washer. US thread and 24 spline. 3/4' (19mm) threaded shaft length for guitars with thick tops.
OEM on many Les Pauls and other guitars.
Audio Taper Pots are generally used in both Volume and Tone Positions.
Rule of thumb - 250K pots are generally used with single-coil pickups. 500k pots are generally used with humbuckers.