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This Alpha 5K Linear potentiometer is a two-in-one, good in a breadboard or with a panel. It's a fairly standard linear taper 5K ohm potentiometer. It's smooth and easy to turn, but not so loose that it will shift on its own. We like this one because the legs are 0.2" apart with pin-points, so you can plug it into a breadboard or perfboard. Once you're done prototyping, you can drill a hole into your project box and mount the potentiometer that way.
Folks love Alpha pots for their reliability and consistency - and we agree! They make great low-cost, high-quality potentiometers
This potentiometer has a round (not T18 or flattened) shaft that is nominally 6mm diameter (we measured 6.3mm with our calipers)
Once you're done prototyping, you can drill a hole into your project box and mount the potentiometer using the included washer and hex nut.