evo.com | SRAM Chains > The SRAM Eagle Transmission PowerLock 12-Speed Chain Link delivers tool free connections for SRAM's 12-speed Transmission chains. Compatible with SRAM Eagle Transmission Chains PowerLock(R) SRAM chain engineers developed PowerLock(R) as a tool free, sure, and consistent way to connect their chains. While PowerLock(R) does not require special tools for install, the especially tight tolerances of 10-, 11- and 12-speed drivetrains mandate that each PowerLock(R) is good for a one-time application only. | SRAM Eagle Transmission PowerLock 12-Speed Chain Link 4-Pack - 4-Pack in Black