Guitar essentials: the guitar saddle file set is used for shaping string grooves, helping to smooth contact points on strings and operate quietly. Flat files are ideal for polishing nuts and bridges. Grinding needle size: the stainless steel guitar saddle file set includes 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 various instrument needs. High-quality material: the guitar bridge saddle file set is made of stainless steel, offering a smooth surface, durability, resistance to deformation, and long-lasting performance. Easy to carry: the file set features a compact, organized case with a hanging hole for convenient storage. Everything stays in one place, saving space and preventing loss. Wide application: compatible with various stringed instruments including guitars, ukuleles, and basses. A practical choice for music lovers, music teachers, musicians, and guitarists.