Need some Help with choosing Nut files

nut slot files   Dan nuts and bolts slot

Our tempered edge-cut nut files produce round-bottom slots, to ensure that the strings seat properly in the nut without buzzing Each chrome-alloy steel

Nut files are used to create or modify the slots in guitar and bass nuts These hardened stainless steel files are specially designed for nut slotting They set of 8 nut files LT-1020-000 Nut File Set

slot journey productsnut-slotting-file-set-8-pcs-010-056-inch Not cheap I know, but decent nut files aren't  I saw a YouTube video, where a guy gave two options to cheaply but accurately file nut slots 1 ) Cut little notches in the edge of a feeler