Description: [HIGH QUALITY]: Electric guitar intonation tool is made of high quality metal material, durable. [FUNCTION]: Tremolo system intonating tool to set the intonation on bridges. Accurate intonation, provide easy and precise adjustments. [USAGE]: Slacken the string (remembering to loosen the locking nut first), and then slip the lugs of the intonation setting tool between the back of the bridge and the fine Tuning Tool. Tighten the screw until it begins to grip. [ADVANTAGE]: This tool is essential to an accurate setup of electric guitar bridges. You could set intonation much more quickly and accurately than doing it manually. [WARM TIP]: Don't try adjusting with the string up to tension, you need to slacken, adjust, re tuning. Work only 1 string at a time and only loosen 1 bridge saddle at a time. Specification: Material: Metal Size Chart: 5.78cmx1.2cmx1.2cm/2.28inchx0.47inchx0.47inch Package Includes: 1 Tremolo System Intonating Tool Note: Please allow slightly errors due to manual measurement and different monitors.