The Hosco Groobar is a set of steel nut slotting gauges in four different thicknesses 1.07 mm, 1.27 mm, 1.42 mm and 1.65 mm (.042", .050", .056" and .065") that allow you to quickly set the depth of the string slots. They are placed on the fretboard up against the nut to act as a depth stop, simply file the nut slot until the file touches the gauge and the nut slot is exactly that height above the fretboard.

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