Other advancements include a new inner plate finish plus chrome hardened pin construction, both for longer chain life. The Hollow Pin™ construction of SRAM’s 11 speed chain provides smooth, precise shifting & weight savings without sacrificing strength. Power Chain II Extremely strong. Incredibly precise. SRAMs Power Chain II increases front & load shifting performance without sacrificing rear shifting precision. The Step 2™ riveting process increases the Push Pin Power for increased strength & durability. Power Lock SRAM chain engineers developed Power Lock as a tool free, sure & consistent way to connect our 11 speed chains. While PL does not require special tools for install, the especially tight tolerances of 11 Speed drive trains mandated that each Power Lock is good for a one-time application only.