Features: High quality Vintage Forge Nickel metal strap button set comes complete with 2 buttons, 2 matching screws, and 4 felt washers (both black and white). These are modern style strap buttons and will fit virtually any Acoustic or Electric Guitar, Bass, Mandolin and Ukulele. Easy to install. Specifications: Material: Metal Finish: Nickel Button Top Diameter: 13.5mm Base Diameter: 10mm Height: 9.5mm Screw Length: 25mm (18mm exposed) Weight: 14g (0.5oz)