No weakest link. SRAM's PowerLock connecting link is the only secure tool-less attachment device for a SRAM 10-speed chains. Compatible with SRAM 10-speed chains From a long line of tough, light-weight chain engineering from SRAM. No tools necessary to install Allows for quick and easy maintenance Pack includes 4 connectors PowerLock technology: SRAM chain engineers developed PowerLock as a tool free, sure, and consistent way to connect SRAM chains. While PowerLock does not require special tools for install, the especially tight tolerances of 10-, 11- and 12-speed drivetrains mandate that each PowerLock is good for a one-time application only.