Outstanding addition to your guitar. Skull nickel knobs with a rustic design. They will fit a 6 mm knurled split potentiometer shaft. 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. I also can make these knobs fit a 1/4" smooth potentiometer post. The price is for a set of two knobs.