Feature 113 different sizes of round files for polishing the string slots, and it makes the string slot very smooth. 21 flat file for burnishing the nut and bridge. 3Adopting premium aluminum alloy material, anti-rust and sturdy. 4Storage box and files are integrated together, compact size, easy and convenient to use and carry. 5Very ideal DIY tool for string instruments, such as guitar, bass, etc.SpecificationFeatures: 13 different sizes of round files for polishing the string slots, and it makes the string slotvery smooth. 1 flat file for burnishing the nut and bridge. Adopting premium aluminum alloy material, anti-rust and sturdy. Storage box and files are integrated together, compact size, easy and convenient to use andcarry. Very ideal DIY tool for string instruments, such as guitar, bass, etc. Specification: Condition: 100% Brand New and High Quality Matrial: Stainless Steel Color: Dark Blue+Silver(Shown as pictures) File Quantity: 13 Round Files & 1 Flat File Box Dimensions: Approx. 7.5x2.8x1.3cm/2.95x1.10x0.51" Round Files Diameter: Approx. 0.4mm/0.015", 0.5mm/0.019", 0.6mm/0.023", 0.7mm/0.027", 0.8mm/0.031", 0.9mm/0.035", 1mm/0.039", 1.1mm/0.043", 1.2mm/0.047", 1.3mm/0.051", 1.4mm/0.055", 1.5mm/0.059", 1.6mm/0.062" Weight: Approx. 24g Packing List: 1 x Guitar Nut Bridge File Set