Description: This is a handy set of 13 round files( for the depth of string slots) and 1 x flat file( for the height of nut and bridge). Absolutely perfect for filing string slots into nuts and bridges for stainless steel box guitars. Suitable for guitar, mandolin, bass,ukelele and banjo, almost suitable for strings any specification between 008-058 corresponding of the string slots. The round files are not very sharp, need a little long time to file, but the string slots will be very smooth, there will be no noise and no uneven vibration. Material: Stainless Steel Size Chart: Stainless Steel Box: Approx.7.5*2.8cm/2.95*1.1inch Round File Length: Approx.6.5/2.56inch Flat File Length: Approx.6.5/2.56inch Package Includes: 1 x Guitar Nut/Bridge File Set Note: Please note that these files are especially the smaller ones are thin metal and can easily bend. Recommended use is for wood and bone, and soft metals such as brass, copper or aluminum only. The color might be slight different from the picture due to some factors, such as lighting effect. Please allow slight deviation of measurement for manual measure.