Description: Made of quality stainless steel material, features good abrasion performance, not easy to wear and tear, sturdy and durable for using a long time 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 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 Suitable for most types of bicycles, good helper in daily life, keep your bike running normally and bringing more convenience for most people! Specification: Material: Stainless Steel Size(LxW): 125x42mm/4.9x1.7inch Package Includes: 1 Piece Bicycle Chain Checker