Feature: 
These are plastic control knobs with plastic insert, fit 1/4"(6mm) shaft potentiometers.
Plastic control knobs to be assembled to potentiometers for easier rotation.
Material: Plastic
Pattern: Ribbed threaded knurled
Dimensions:
Max External Diameter: 15mm
Top Diameter: 11mm
Shaft Hole Diameter: 6mm
 
Notice:
 
Just potentiometer knobs, potentiometers are not included here.
 
Package included:
 
30 x Potentiometer knob caps