Fingerboard guards are designed to protect the fingerboard while working on a fret.
Pack of 2 guards includes one narrow guard for protecting frets closer to the bridge.
The wider guard has 3/8" (9.5mm) of coverage on either side of the fret, the narrow guard has 1/4" (6.35mm) of cover.
79mm overall length, the fret slots are 2.8mm wide x 69mm long.