Mentor-Digital-Turning-Knobs-6-6-35mm-Shafts-Mentor-6622-1000-p-This-digital-turning-knob-from-Mentor-has-been-designed-for-precision-potentiometers-Assemble-direct-onto-the-potentiometer-spindle-p-Mentor-6622-1000-Digital-Turning-Knob-6-35mm-Shaft-30-4mm