Outstanding addition to your guitar. Mercury dime with knurled sides, volume, and tone control knobs. They are fitted with a set screw and will fit both a 6 mm knurled split potentiometer shaft. I also can make them fit a 1/4" smooth pot. I hand make them in the USA. Truly unique and an upgrade that will turn heads. Please check my feedback and buy with confidence. Please message me if you need more than two knobs.