Features: Suitable for 4mm/0.16inch diameter metric thread. Easy to install, equipped with threaded inside, good for fastening. Great replacement and upgrade the appearance of your guitar. Suitable for guitarists, music enthusiasts, and professional performers, both beginners and experienced guitarists can benefits from its use. Suitable for various music performances, studio recordings, personal exercises, and stage performances, it can meet different performances styles and music needs. Specifications: Material: Metal Color: Silver/Black/GoldColor Quantity: 5PCS Thread Diameter: Approx. 4mm/0.16inch Package Includes: 5pcs Knob Tip Caps note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.