Features:Material: PlasticColor Black， Silver ToneFit for Knurled Shaft Diameter 6mm/ 15/64"Overall Size 14 x 16mm/ 0.55" x 0.6"(D*H)Weight 24gPackage Included 10 x Potentiometer Rotary KnobsDescriptions:This Rotary Knob is made of plastic material， fit for 6mm Knurled Shaft， a built in screw make it can be adjustable.　Package Includes 10 X Rotary Knob