CTS 250k Audio Taper Push Pull Pot - US Thread and 24 Spline. Includes Nuts, Lock Washer and Dress Washer. Used to control pickup phasing series/parallel switching coil-taps and more.

The threaded portion on the shaft is 10mm long. Diameter of the threaded portion of the shaft is 3/8" (9.5mm). Diameter of the Split Shaft / Spline is 6mm.
Requires 1" (25mm) cavity depth.