Features 1、Nut and saddle are made of genuine bone, able to improve the sound quality of your guitar, and make it more playable. 2、Well-made pre-cut 6 string bone nut for acoustic guitar, electric guitar. 3、Needle files set comes in 13 different sizes from 0.14in to 0.61in. Specification Basic replacement tool kit to rebuild or repair the acoustic/classical, electric, and vintage guitar. Features: Nut and saddle are made of genuine bone, able to improve the sound quality of your guitar, and make it more playable. Well-made pre-cut 6 string bone nut for acoustic guitar, electric guitar. Needle files set comes in 13 different sizes from 0.14in to 0.61in. Use the fine grit sandpapers(320/240 grits) and file to fit. Minimal sanding is required to ensure a nice fit in the nut slot. Note: *Depending on your guitar to do some sanding and filing may required. Specifications: Material: Metal Nut Size: 4.3*0.6*0.9cm / 1.69*0.23*0.35in Saddle Size: 7.2*0.3*0.9cm / 2.83*0.11*0.35in File Size: 0.4mm-1.6mm / 0.14-0.61in Sandpaper Grit: 320 grits(3pcs), 240 grits(6pcs) Package Size: 12*8.2*1cm / 4.72*3.22*0.39in Package Weight: 40g / 1.41oz Packing List: 9 * Emery Paper 1 * Nut 1 * Saddle 1 * Nut File Set Package List 9 * Emery Paper 1 * Nut 1 * Saddle 1 * Nut File Set