
Dimmer switches with round knobs are the most common switch used in dimmer settings. Also called rotary dimmer switches, the round knob simply clips on to the dimmer switch and rotates in either direction, on or off. For switches with dimmer knobs a standard switch plate can be used because the knob itself will cover up the rectangular switch hole. Dimmer knobs come in a variety of colors and typically cost just a few dollars each.
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