Schlitzmutter 3/8" (für 18t Lorlins)
These are special potentiometer nuts which have a smaller diameter like they're used on recording consoles.
These nuts work better if you want to use small knobs.
3/8" thread (check the datasheet of the potentiometers you're using if that's the right thread) full metal part
Thickness: 2,5mm
Outside Diameter: 13,5mm