Check the listing for details. 2Pcs Aluminum Guitar Knobs Black Control Knobs for Electric Guitar Bass. Condition: New. Listed at 10.86 USD. What is this?Upgrade your guitar's look and performance with these aluminum control knobs, designed for smooth volume and tone adjustment. Perfect for electric guitars and bass, these knobs offer a lightweight yet durable solution for precise tuning.What will I get?Material: Aluminum;Hole Dia: 6mm(0.24");Outer Dia: 18mm(0.71");High: 18mm(0.71");Color: Black;In the package of: 2Pcs x Guitar KnobsAny advantages of this product?Lightweight and durable aluminum, strong yet lighter than brass, reducing strain on pots; Precision CNC machined ensures perfect fit and smooth rotation.Knurled texture prevents slipping during adjustments.How to use it?1. Confirm your guitar's potentiometer shaft is 6mm (0.24");2. Align the knob with the shaft and press firmly until secure.3. Adjust volume/tone effortlessly with the knurled grip.