Polishing frets and other fret work just got a whole lot easier with MusicNomad's patent pending GRIP Guards. The premium fretboard guards are made using a high precision process that produces a very smooth finish on our high quality stainless steel material, which is nonmagnetic, corrosion resistant and heat resistant. The special engineered curved angle contours to all fretboards. The innovative ergonomic handle makes any fret job easier, quicker, and keeps your fingers from getting in the way. The set of 3 GRIP Guards works on all string instruments and includes 1 each for small, medium and jumbo fret slot sizes. The ideal width lets you work up and down any fretboard whether a guitar, bass or even a ukulele.