Better than your basic guards! Our improved design fits all fretwire sizes, anywhere on the neck. Protect your fretboard when filing or polishing a fret. - New slot sizes: Two guards each for medium and wide frets. The extra length fits 5 and 6-string bass guitars. - New slim profile: guards now fit between ALL the frets on basses — even the high frets. - New notches: a nice touch for holding the guard in place with a rubber band, freeing both your hands for the job. Tip of the hat to Steve Olson of Elderly Instruments for this idea! - Clean professional fret work! Each of these handy guards fits over a fret for safe filing and polishing, to help keep your fretboard clean and unscratched. They're made of flexible 0.010 stainless steel for durability and long life. Dimensions: Overall size: 3-1/2 x 7/8 (88.90mm x 22.23mm) Medium slot: 0.097 x 3.095 long (2.46mm x 78.61mm) Wide slot: 0.125 x 3.120 long (3.18mm x 79.25mm)