Complete Gauge Set 9 stainless steel understring gauges covering the most common fretboard gauge sizes. The gauges slip under the strings for quick reference and are clearly etched for easy size identification. Compact and easy to handle, they store in your guitar case or tool drawer when not in use. Compact and Easy to Use Each gauge is clearly etched with its size for fast identification. Slip the gauge under the strings to read without removing them, then it to your case or toolbox. Effortless Guitar Bass Setup Easily and accurately measure the curvature of your fretboard. Helps you set bridge saddles to match the fingerboard for string height and playability, reducing fret buzz. Construction Made from stainless steel. T shaped rulers are rust resistant and wear resistant, designed to last and to remain a reliable part of your guitar maintenance toolkit for years. Use scenarios After string changes: verify fretboard curvature and adjust saddle height to maintain consistent action. Routine setup and maintenance: quickly check neck relief and fretboard geometry for guitars and basses. Mobile or workshop use: keep a compact, durable gauge set in your case or tool drawer for on the go adjustments.