Gauged Nut Slotting File Set for Bass, For 4-String - Set of 4

Produce round-bottom nut slots so your strings seat properly without buzzing!

1 Pcs Guitar Nut Slotting File Saw Bar Slot File Set Needle File Set Portable DIY Guitar Groove Grinding Repair Tool Accessories - AliExpress

Guitar Nut File Set, Bridge Saddle Nut Files 13 Neddles Set Tool Kit for Instrument String : Musical Instruments

I make terrible but effective nut files from feeler gauges : r/Luthier

Simply stack the appropriate gauges on the fingerboard, against the front edge of the string nut, and file the nut slot down to the top of the stack.

StewMac Feeler Gauges 1811

StewMac Guitar Pliers Set, Set of 4

Guitar Nut Slotting File Saw Rods Slot Filing Set Portable DIY Guitar Repair Tools Luthier Replacement Tools Accessories

Digital Nut Slotting Gauge - For Guitar and most stringed instruments

U•Bass TUSQ Nut - 4 String – Kala Brand Music Co.™

Bass Guitar Nut File Set, 3 files - Philadelphia Luthier Tools & Supplies, LLC

StewMac Digital Nut Slotting Gauge, For Guitar and Most Instrument