Your choice of a flat or domed set of two mercury dime with Kennedy half dollar guitar knobs,Mercury dime and Kennedy half dollar volume and tone guitar knobs with aluminum sides. These knobs are handcrafted in the United States. They are 3/4" in diameter and 5/8" high and will be a unique addition to your favorite guitar. They will fit a common 6 mm knurled split potentiometer post. The $47.50 price is for a set of two knobs. Please reads my feedback and buy it with confidence. Contact me if you need more than two knobs. Thank you for looking. Leave a note with your choice.