The GPS-24 adds stability and security to the bottom bracket removal and installation process.The guide pin simply threads into any of the thirteen Park Tool bottom bracket tools which feature integrated threads (see Product Compatibility for full list). A 5 mm hex fitting is integrated into the threaded end for secure and easy installation and removal.Once installed, the extra-long 24 mm pin engages into the bottom bracket, bolstering the fitment of the bottom bracket tool and preventing misalignment.- Sized for bottom brackets with a 24 mm spindle- Usable length of pin: 61 mm (2.4")