9Pcs Understring Radius Gauge + String Action Ruler Gauge Tool + Guitar Bridge Saddle Nut Files Set Guitar Repair Tool Accessori _x000D_ _x000D_ USAGE RANGE this tool set is suitable for measuring all kinds of electric & acoustic guitar, electric bass, electric box guitar fretboard that measured in radians to adjust the strings piano code._x000D_ GUITAR BRIDGE SADDLE NUT FILES:_x000D_ 1.Made of high-quality steels, perfect tools filing string slots into nut and bridge._x000D_ 2.With 0.4mm / 0.5mm / 0.6mm / 0.7mm / 0.75mm / 0.8mm / 0.9mm / 1.0mm / 1.05 mm / 1.1mm / 1.2mm / 1.4mm / 1.6 mm different size, 25mm grinding length and 30mm length of the hilt._x000D_ 3.These longer-shaft files are easier to use than the shorter ones commonly available at home improvement stores_x000D_ _x000D_ 9PCS RADIUS GAUGE:_x000D_ Color: silver_x000D_ Material: Stainless steel_x000D_ 1 x 9 understring radius gauges ( 7.25, 9.5, 10, 12, 14, 15, 16, 17and 20)_x000D_ STRING ACTION GAUGE RULER:_x000D_ String ruler side:_x000D_ Material: plastic_x000D_ Size: 55mmx90mmx1mm_x000D_ Weight: about 10g_x000D_ Graduations displayed: mm and inches_x000D_ Measuring string height, frets, nuts, saddle, and other parts of a guitar_x000D_ Holding this card to the strings, you can visually find the suitable string height._x000D_ Fritz ruler side:_x000D_ Could be used for gut guitars, electric guitars (raise or lower string height), acoustic guitars,_x000D_ and bass guitars (including six string bass guitars) to adjust the string space._x000D_ _x000D_ Package Contents:_x000D_ 1 x 9PCS RADIUS GAUGE_x000D_ 1 x STRING ACTION GAUGE RULER_x000D_ 1 x GUITAR BRIDGE SADDLE NUT FILES_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm._x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_