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I have no idea exactly what to use this for. The grit is so coarse I have a hard time polishing the striations, & scratches in the frets out. I am an old school three sided file with safe edges ground on the corners, or I use a fine single cut Swedish pillar file, with safe edges, and create my own crowns 100% by hand. I suppose these might be okay for knocking a .048" down to a .036" fret. It is still far too coarse a grit for my tastes. I started doing luthrie back in 1980.