A worn chain shifts poorly and wears sprockets at an accelerated rate. 0.75% and 1%, the points at which chain experts suggest replacement. <br> <br> <strong>Features:</strong> <br> Simple and easy to use.  <br> Compatible with all chains. <br> There are two different measurements: 0.75 and 1. If the 0.75 side fit in your chain, please check it more often and replace the chain when it is at 1.  <br> An useful tool to check worn condition of bicycle chain. <br> <br> <strong>Specifications:</strong> <br> Color: Silver <br> Material: Carbon steel <br> Length: 14cm / 5.5in <br> Weight: 36g / 1.29oz <br> <br> <strong>Package List:</strong> <br> 1 * Chain checker