250K Solid Shaft Audio Taper Potentiometer For Electric Guitars, Guitar Amplifiers, Radios Etc. Good quality imported potentiometer for repairs to electric instruments, guitar amps, radios, etc. Plated metal case is easy to solder to. Body of pot measures .949" diameter. Solid aluminum shaft for standard set screw knobs measures .234" diameter. I tried an old DAKA-WARE set screw knob and it fit fine. 11mm mounting nut and beauty washer are included. We also provide a free lockwasher.