switch tip and arm knob set, parchment relic These ST tremolo arm knob and switch tip are intentionally aged to match the rest of a vintage guitar. The intentionally aged knob and swithc are part of the relic serie parts that we carry. You can upgrade all the parts on your instrument to high quality reliced parts to fit your vintage instrument. The tremolo arm knob has an inside diameter hole of 5 mm and the switch tip is for USA made switches. Colour: Aged parchment