Fret Slotting Miter BoxThe miter box is the ultimate tool for hand cutting perfect fret slots. Originating from the in house guitarmakers' years of use and improvements, it allows a fret saw to glide smoothly through ball bearing rollers, ensuring the blade cuts at a perfect right angle to the fretboard. With its uncluttered design, you can clearly see and feel the slot cutting process, and easily set and control the slot depth.