National Medium Main Black Tuning Knob for Receivers in Nice ConditionIf your radio has this knob missing or if the one you have is marked up bad, This is a great find for a hard to find item!It makes such a difference to replace the scratched or broken knob, as it is a focal point of attention.This knob Measures 1 1/2 inch in diameter and 13/16 inch deep.The inlay is intact and in good shape.