Take it from Dan Erlewine, "A fret won't seat well if its slot isn't clean!" We developed this tool to effectively scrape away wood chips and old glue, for better fret seating. It can be used to scrape the bottom and the wall of the fret slot, and when the tool is held with both hands for control, it pries up dried glue. The special hooked, square-edged chisels get into the corners of the slots on bound fretboards. The Fret Slot Cleaning Tool features: Comfortable handle Metal collet 2 replaceable hooked .019" thin square-edged chisels This Fret Slot Cleaning Tool measures 5-1/2" total, and comes with 2 replaceable chisel blades.