The guitar nut and bridge file set with 13 round files and 1 flat file, universal for string instruments, such as guitar, mandolin, bass, ukelele and banjo etc. It will make the string slots very smooth, and it working quietly. Features: Universal for string instruments, guitar, mandolin, bass,ukelele and banjo etc. 13 different dimension round files for polishing the string slots, and it makes the string slot very smooth. 1 flat file for burnishing the nut and bridge. Made of high quality metal, compact and sturdy. Mini size, convenient to use and carry. Specifications: Material: Metal File Quantity: 13 Round Files & 1 Flat File Item Size: 7.7 * 3 * 1.5cm / 3.0 * 1.2 * 0.6in Item Weight: 23.5g / 0.8oz Package Size: 8 * 3.5 * 1.8cm / 3.1 * 1.4 * 0.7in Package Weight: 25g / 0.9oz Package List: 1 * Guitar Nut Bridge File Set Note: Please notice the round file dimension show in the picture. The item only includes the file set.