Electric Guitar Knob, Guitar Speed Control Knob, 4pcs Electric Guitar Knobs Durable Aluminum Alloy Material for Professionals Guitar Bands Instrument Lovers Silver Specification: Item Type: Electric Guitar Knob Inner Diameter: Approx. 5.96mm / 0.2in Material: Aluminum alloyOptional Colors: Black, Silver Package List: 4 x Electric Guitar Knob 1 x Wrench Note: Manual measurement results have errors, the size just for reference. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.