Mercury dime and Kennedy half dollar volume and tone guitar knobs with aluminum sides. These knobs are handcrafted in the United States. They are 1" 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 $49.00 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.