Amazon.com: Guitar Bridge Saddle Nut Files Set - 13 Different Size Needle Files with Circular Cross Section and 9 Pcs Sand Paper For Bass, Ukulele, Acoustic & Electric Guitar nut slot polish -
Gauged DiamondCut™ Nut Slotting File Set for Acoustic Guitar - StewMac
Luxtrada 10pcs in 1 Guitar Fret Nut Saddle Slot Grinding File Set Luthier Repair Tool - Walmart.com
Amazon.com: SAPHUE Guitar Nut File Set and Bridge Saddle Fret Nut Slotting Files Set for Gibson Electric Guitar Acoustic Guitar Ukulele Bass Banjo Mandolin with 13Pcs Needles and 1Pcs flat file Repair