The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary Compatible with any 5-12 speed derailleur chain including Sram AXS and is designed to accurately indicate when a chain reaches .5% and .75% wear Chain Checker Silver/Blue 5-12sp CC-4UPC/EAN/GTIN: 763477001351