Guitar Fret Wire

fret slot width   Dan fret slot width

It's hard to tell from the picture, but I'm guessing you're around 132 wide on the slot That's ~ 031, and the blades for fret slotting are

Also, as a brief answer to this topic, the standard seems to be a 020 tang in a 023 slot So the slot should be 003 bigger than the tang  List of tools used in this video: StewMac Fret Slotting Miter Box: LP3BKL

lucky firecracker slot This has mm crown height and mm crown width which will allow it to be dressed level down to a uniform height of around mm on frets 1 to 24 Typical fret wire has a tang width Rounding to allows a max tolerance of 12 tang width OK for me; don't know about you