Durable to use: The bicycle chain wear indicator is made of quality carbon steel with nickel plated on the surface, which has good abrasion performance, not easy to wear, sturdy and durable for prolonged use Suitable size: the length of the chain wear indicator tool is approx. 14 cm/ 5.51 inches, with flat design and suitable size, it is lightweight and portable to carry and store without burden, taking up less space Simple operation: just insert the wear checker of the chain in the bicycle chain, if the end (.75) cannot be inserted, the chain wear rate is normal and it is not necessary to replace it, if the (.75) ) can be inserted, it is recommended to replace the new chain, and if the end (1.0) can be inserted, the chain should be replaced as soon as possible Important cycling repair tool: the gauge measuring ruler can be applied as a basic and important tool in daily life, helping you to measure the wear rate of the chain to determine whether a new chain is needed, which can effectively prevent the accelerated wear of flywheel and disc Wide range of applications: the bicycle chain measuring tool can be applied to most kinds of bicycles, a good helper in daily life, let your bicycle work normally and bring more convenience for most people