Alpha 1 Meg Concentric Stacked Dime Size Barrel Potentiometer 
6mm top shaft, 8mm bottom
Threaded bushing is 3/8" diameter x 3/8" long
Overall length is 1 3/4"

Traditional mini dime-sized pots, stacked! Independent radial controls for both knobs. This thing packs a huge punch in a small space.
Finally, a 1 Meg concentric stacked pot! These are so awesome. 1 Meg pots show your pickup directly to the world, with virtually no interference or attenuation of high frequencies. For the true tone freak!

High quality, made in Korea