Product name:Bicycle Chain Wear Indicator Ruler Product size about :13x5cm 5.11x1.96in Product color: As shown in the figure Product material:aluminium alloy product features: - Bicycle Chain Wear Indicator Ruler Repair Tool Stainless Steel Mountain Road Bike Chain Gauge Measurement Checker Screw Diameter - Made of aluminum alloy material, lightweight design, anodized, finely sandblasted, three-stage measurement, familiar with chain loss. -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1pcs Bicycle Chain Wear Indicator Ruler