Durable to use: the bike chain wear indicator is made of quality carbon steel material with nickel plated on the surface, which features good abrasion performance, not easy to wear and tear, sturdy and durable for using a long time Appropriate size: the length of the chain wear indicator tool is approx. 14 cm/ 5.51 inches, with flat design and proper size, it is lightweight and portable to carry and store without burden, taking up less space Simple usage: just need to insert the chain wear checker into the bike chain, if the (.75) end can not be inserted, the wear rate of the chain is normal and there is no need to replace it, if the (.75) end can be inserted, it is recommended to replace the chain, and if the (1.0) end can be inserted, the chain must be replaced as soon as possible Significant cycling repair tool: the chain gauge measurement ruler can be applied as basic and important tool in daily life, helping you measure the wear rate of the chain to determine if a new chain is needed, which can effectively prevent accelerated wear of the flywheel and disc Wide range of applications: the bike chain measurement tool can be applied for most types of bicycles, good helper in daily life, keep your bike running normally and bringing more convenience for most people