No weakest link. SRAM'S 11-speed chain features the PowerLock® connecting linkthe only secure tool less attachment device for a SRAM chain.SRAM chain engineers developed PowerLock as a tool free, sure and consistent way to connect our 11-speed chains. While PowerLock does not require special tools for install, the especially tight tolerances of 11 Speed drive trains mandated that each PowerLock is good for a one-time application only. A pack of four SRAM PowerLocks.THINGS TO REMEMBERPart of the SRAM 1xintegrated drivetrainNo tools necessary to installFrom a long line of tough, light-weight chain engineering from SRAMA pack of four SRAM PowerLocks.