Route 66 volume and tone guitar knobs. A real head turner . They have aluminum sides and come to fist a 6 mm split knurled shaft. I can also make them to fit a 1/4" smooth shaft with a set screw, just leave a note.Please let me know if tou need more then two. shipping will be the same flat 4.50. I hand make all my knobs here in the USA. Check my feedback on other platforms and buy with confidence.