Description: Feature: This Bike Chain Tensioner offers great and smooth shifting, easily adapting to various road conditions. Whether you're a beginner or an experienced cyclist, it is easy to use and handle.Material: Made of aluminum alloy, this Rear Derailleur Chain Tensioner is reliable, stable, and reliable. It can maintain stable shifting even on rugged terrains.Versatile Compatibility: This Folding Bike Chain Tensioner is suitable for internal 3 speed external 1 speed, internal 3 speed external 2 speed, internal 3 speed external 3 speed.Aesthetic Design: The Chain Tensioner with a sleek and elegant look that harmonizes with your bike's overall design. Nice accessory for cycling lovers. Lightweight and compact, easily install and use.Product Details: The Bicycle Chain Tensioner measures at 16.5cmx6.5cm/6.50inchx2.56inch in size. The package includes a chain tensioner and two screws for easy installation. Specification: Material:Aluminum Alloy Size Chart: 16.5cmx6.5cm/6.50inchx2.56inch Package Includes: 1Bike Chain Tensioner2 Screws Note: Please allow slightly errors 1-2cm differences due to manual measurement.