Durable to use: The bicycle chain wear indicator is made of quality carbon steel with nickel-plated surface, which has good abrasion performance, not easy to wear and tear, sturdy and durable for long time use Suitable size: the length of the chain wear indicator is approx. 14 cm/ 5.51 inch, with flat design and proper size, it is lightweight and portable to carry and store without burden, taking up less space Simple operation: just insert the chain wear checker in the bicycle chain, if the end (.75) cannot be inserted, the chain wear rate is normal and there is no need to replace it, if the end (.75) can be inserted, it is recommended to replace the chain, and if the end (1.0) can be inserted, the chain should be replaced as soon as possible Important bicycle repair tool : The chain gauge measuring ruler can be applied as a basic and important tool in daily life, helping you measure the wear rate of the chain to determine whether a new chain is needed, which can effectively prevent the accelerated flywheel and disc wear Wide range of applications: The bicycle chain measuring tool can be applied for most kinds of bicycles, good helper in daily life, keep your bicycle running normally and bring more convenience for most people Specifications: Material: carbon steel Size: approx. 14 cm/ 5.51 inches Package: bag