1Use these to accurately setup your guitar bridge saddles to match the fingerboard radius. 2The kit has nine different specifications of tools to meet the needs of different types of guitar or bass. 39 different types of tool: 9.5 16 12 20 10 15 14 7.25 17. 4Easily use the matching top radius of this gauge to determine the proper height adjustment for bridge saddles. 5Obtain accurate measurements of your instrument's fretboard radius using the bottom radius of the gauge Feature: Use these to accurately setup your guitar bridge saddles to match the fingerboard radius. The kit has nine different specifications of tools to meet the needs of different types of guitar or bass. 9 different types of tool: 9.5 16 12 20 10 15 14 7.25 17. Easily use the matching top radius of this gauge to determine the proper height adjustment for bridge saddles. Obtain accurate measurements of your instrument's fretboard radius using the bottom radius of the gauge Specification: Material: Metal Color: Silver Radius: 9.5 16 12 20 10 15 14 7.25 17 Package list: 9 * Tools Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.