Guitar Nut Files - How to make at home cheaply

I'm not a luthier so it's not like I'm gonna be cutting nuts every day What was keeping me from making a nut is not having the proper files,

High quality file made in Portugal, to repairsandpolish nut slots for fender style necks Set of 2, smooth and bastard finish

guitar nut slot Nut files for guitars · Nut Files with Mag-holder for Acoustic Guitars · Double Edge Nut File Set for bass guitar · Double Edge Nut File Set for acoustic guitar TL

guitar nut slot depth nut slot file? I am guessing it should be the 40, a little I recently had to make a bass guitar nut and only had my 6 string nut files