Material: This Rear Derailleur Adjuster Chain Gap Adjustment Gauge Tool is made of PP, ensuring durability and sturdiness for long term use.Compatibility: It is suitable for GX NX 12Speed 1x12/1x11/1x10/1x7 rear derailleurs, making it a versatile tool for various bike models.Effective Adjustment: This derailleur alignment gauge tool is designed to adjust the derailleur and chain gaps easily and effectively, improving your cycling performance.Easy to Use: With its simple operation design, this tool is easy to use even for beginners, making bike maintenance easily.Size & Package: The product measures approximately 10cm in length, making it compact and portable. Each package includes 1 Rear Derailleur Adjuster Chain Gap Adjustment Gauge Tool, an ideal bike maintenance tool for every cyclist.Specification:Material: PPSize Chart:Length: 10cm/3.94inchPackage Includes:1 Rear Derailleur Adjuster(6 Pack)