CBGITTY Fretting Miter box & Zona saw, simple & affordable! Made special for 1 1/2" wide fretboards & necks.

Miter box:

https://www.cbgitty.com/tools-templates/cigar-box-guitar-fretting-miter-box-kit/

Saw: 

https://www.cbgitty.com/tools-templates/high-quality-fret-slotting-saw-18tpi-made-in-the-usa/