Guitar essentials: the guitar saddle file set is used for grinding the string grooves, which smooths the cracks on the strings and operates without noise. Flat files are used for polishing nuts and bridges. Grinding needle size: saddle file for guitar stainless steel has 13 different diameters: 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.2 mm, 1.4 mm and 1.6 mm, suitable for your different needs. High Quality MaterialThe Nuonove guitar bridge saddle file set, all made of stainless steel, is smooth and easy to use, durable and not easy to deform and has a long service life. Easy to carry: the guitar bridge saddle file set has a perforated design on the top, all in one box. Just turn it on when you need it. It takes up little space, not easy to lose and is easy to carry. Wide application: suitable for many types of stringed instruments such as guitar, ukulele and bass. Ideal gift for music lovers / music teachers / musicians / guitarists.