CTS 500K 295 series split shaft audio taper pot. 4 contacts on carbon wafer, lasts for 250,000 cycles. Threaded bushing is 0.25 inch tall, spline portion is 0.28 inch tall, 0.6 inch total height. Includes nut and star washer.
The pot on the left is a normal pot, the pot on the right is the 295 series