Check the listing for details. Aluminum Potentiometer Knobs 1/4"x1.9" D-Shaped Shaft Top Hat Knobs Black. Condition: New. Listed at 14.08 USD. What is it?Potentiometer knobs could be used in scenes like volume tone control, switch adjustment knobs, guitar/bass DIY switch knobs, knob replacement, great for equipment repairing/instrument lovers.What will I get?D-Shaped Shaft Potentiometer Aluminum KnobInner Diameter: 6 x 4.3mm/1/4 x 0.17 inch (Diameter x Radius)Outer Diameter: 46.5mm/1.9inchHeight: 24.5mm/1 inchMaterial: AluminumColor: BlackPackage Includes: 1PCS x D-Shaped Shaft Potentiometer Aluminum KnobAre there any advantages of this product?Potentiometer knob made of aluminum provides great durability and decent quality with long service life; Produced carefully, keep the inner diameter of the knob around 6 x 4.3mm/1/4 x 0.17 inch, which could fit in most shafts.