The BBTRS uses a springbased tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and preventing slippage and possible cross threading \n Features an M8 threaded rod and a doublesided adapter nut with M12 and M15 threads, allowing it to thread directly into any compatible cartridge bottom bracket \n The M15 adapter can also be used to install any of Park Tool's nine aluminum bottom bracket tools, all of which feature integrated threading for use with the tool