HT1300 21mm Yandaan Tighten Potentiometer Knob Black-Red

 

It is a quality potentiometer head made of ABS material that you can use with standard potentiometers. Its interior is made of first class brass material. 

 

The bottom diameter is 21mm, the height is 16mm and the inner diameter is 6.30mm. It has a black body and red head.