Sram pc1031 10 speed chainsimply stronger the pc 1031 chain benefits from new design changes for better performance sram chain engineers developed powerlock as a tool free sure and consistent way to connect 10 speed chains while pl does not require special tools for install the especially tight tolerances of 10 speed drive trains mandated that each powerlock is good for a one time application only features compatible gears 10 closing link powerlock outer plate nickel inner plate grey pi