Features:These are plastic control knobs with plastic insert, fit 1/4"(6mm) shaft potentiometers management knobs to be assembled to potentiometers for easier rotation: PlasticPattern: Ribbed threaded knurledDimensions:Max External Diameter: 15mmTop Diameter: 11mmShaft Hole Diameter: 6mmHeight: 16mmQuantity: 10 Please note:Just potentiometer knobs, potentiometers aren't included here Package included:10 x Potentiometer Knob