What You Get 4 Pieces silver guitar strap locks buttons to your instrument by replacing existing strap pins or screws. Durable MaterialGuitar strap locks replacements are made of high-quality metal, durable and strong enough to hold your guitar tightly. Guitar Straplocks Retainer SystemThe security strap lock system replaces your original strap pegs or screws without any guitar modification. Quick Release InstallJust pull out the strap-lock button to quick release or install, making it simple to put on or remove from your strap without scratching or damaging your strap. Widely Usagewidely used for acoustic guitar, classical guitar, electric guitar, bass, ukulele, banjo and other instruments with standard straps. Suitable for the strap hole diameter of 10.7-20mm, not exceeding 2.5mm strap thickness. Specifications: Material: Metal Color: Silver Screw Diameter: 3.7 mm Please Note They are not genuine Schaller strap lock system, also is not compatible with genuine ones The diameter of the guitar strap hole should be between 10.7mm and 20mm The thickness of the guitar strap cannot exceed 2.5mm Packing Included: 4 x Guitar Strap Lock (Silver) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.