nut file 15 cm length, teeth per inch: 66, 056″ / 1,42 mm
A high quality nut file. A string seated in a properly filed nut will have the correct height and will also prevent extraneous string noise from the nut.
0.056″ / 1,42 mm width.
A typical set for classical guitar would contain the following files:
0.028″, 0.032″, 0.036″, 0.042″
A typical set for electric and acoustic guitars will depend on the string gauges. Always check the string package for the string gauges and use the same file gauge accordingly.
A great aid in filing nuts is the H-GB4 Hosco GrooBar. This will prevent you from filing the string slot too deep.