500K Blend Potentiometer 
6mm split shaft includes dress washer and mounting nut. Threaded bushing is 7.8mm/.30" diameter x 10mm/.39" long. Overall shaft/bushing height is 18.2mm/.71"

Use these to control the signal mix from 2 pickups, panning from one to the other. Usually, 500K is used for humbuckers. 250K will attenuate high frequencies.

High quality, made in Korea