Durable: The bicycle chain wear indicator is made of high-quality carbon steel material with nickel-plated surface, which has good wear resistance and can be used for a long time Appropriate size: The length of the chain wear indicator tool is approximately 2.14 cm / 5.51 inches. Flat design, easy to carry and store, without any burden, and takes up less space Easy to use: Insert the chain wear checker into the bicycle chain. If the (.75) end cannot be inserted, the chain is normal. If the (.75) end can be inserted, it is recommended to replace the new chain. If the (1.0) end can be inserted, The chain must be replaced as soon as possible Bicycle repair tools: The chain gauge measuring ruler can help you measure the wear rate of the chain, so that you can confirm whether you need a new chain, and effectively prevent the pulley from wearing Wide range of applications: Bicycle chain measuring tools can be used for most types of bicycles, a good helper in daily life, keep the bicycle running normally and bring more convenience to most people