Description: 【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: PP Size Chart: Length: 10cm/3.94inch Package Includes: 1 Rear Derailleur Adjuster(6 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.