Sell Knob (Color Potentiometer Knob)

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The product is a round project, use to assembled to a potentiometer and makes it easier rotation.
The term may also refer to a movable control knob used to change the settings of the controlled instrument, for example, to change the frequency of the radio1. a projecting part, usually rounded, forming the handle of a door, drawer, or the like.
2. a rounded lump or protuberance on the surface or at the end of something, as a knot on a tree trunk.
3. Architecture. an ornamental boss, as of carved work.
4. a rounded hill, mountain, or elevation on a ridge.
verb (used with object)
5. to produce a knob on.
6. to furnish with a knob.
7. (in stone cutting) to knock off (excess stone) preparatory to dressing; knobble; skiffle.