Features: Universal: This bike chain checker can quickly detect chain abrasion, and one size fit for almost any bike chains. Usage: This cycling chain checker can help you to detect the chain abrasion condition, determine if you need to replace. Portable size: Bike chain checker is convenient to carry and store, it is small and lightweight, wont take much space. Material: The chain checker is mainly made of aluminum alloy, it is soild and durable, can be used for a long timing. Easy to use: The chain indicators is designed with clear mark, easy to read, the surface is smooth and fine, comfortbale to use. Specifications: Material: Aluminum Alloy Color Options: 6 Colors are Available as Shown in the Picture. Package Weight: approx.35g Length: approx.13.5cm/5.31in Package Includes: 1Pc Chain Wear Checker note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!