New Brass Nut for Electric Guitar, Compatible with 42mm Nuts Width: 41.8mm Thickness: 3.3mm Height: 4.3mm (at the highest point, between the 3rd and 4th strings) String Spacing: Approximately 34.2mm (see image. This is approximate as it's difficult to measure precisely) Compatible with 42mm neck and 42mm nut, but can also be used on a 43mm neck if the string spacing is correct.