Guitar strap lock buttons are compatible with acoustic, electric, or classical guitar straps, bass, ukulele, etc. - Package contents: 4 x Guitar strap buttons with screw and washer - Strap buckle head diameter: 14mm - Bottom diameter: 9mm - Height: 8.5mm - Screw size: 25x3.5mm - Washer diameter: 12mm - Durable and corrosion-resistant metal strap buttons - Wide flanges to secure the strap and instrument - Replace standard buttons for a tighter fit when working with the strap - With soft felt pad to better protect the guitar from scratches - Easy to install with screws and pads, just make sure to drill the hole - Verify the size before placing the order