Check the listing for details. Alpha Potentiometer A250K Concentric Stacked Pot. Color: Silver, Condition: New. Listed at 11.20 USD. A250K Concentric Stacked Potentiometer6mm top shaft, 8mm bottomThreaded bushing is 3/8" diameter x 3/8" longOverall length is 1 3/4"These are great for stacking tone and volume in one control. NO center detent. This design is far more compact and lower profile than a normal concentric stacked pot. With a barrel housing that is just a little over half an inch tall and wide, you have tons more room to work within your control cavity. The elongated shafts also provide more room to move the knobs up and down as desired. This has the same shaft measurements, same threaded bushing length and diameter of a regular concentric pot in a far better, more compact design. These are perfect for any guitar, bass, keyboard, PA or amplifier application. High quality, made in Korea**Please note that not all pots are stamped with the word "Alpha", however, they are all Alpha pots from the same supplier.