Laser-cut CC-4.2 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 determining when chain replacement is necessaryWorks on any 5 to 13-speed derailleur chain (including SRAM® T-Type, SRAM® Flattopâ¢, Shimano® XTR® 12-speed, and Campagnolo® Ekar⢠13-speed chains) or single-speed chainsDesigned to accurately indicate when a chain reaches 0.5%, 0.75%, and 1.0% wearChain CheckerSilverCC-4.2UPC/EAN/GTIN: 763477001573