CTS stacked concentric audio pots, intended for pickguard mounting. Pot is 1 and 15/16 inches total height. Distance from bottom of pot to the bottom of the threaded portion is 7/8 inch.
Inner pot - 500K audio, diameter 3/16 inch, 4.77 mm
Outer pot - 500k audio, diameter .265 inch, 6.75 mm.