Required for Öhlins fork rebuilding and cartridge installation of Öhlins FKS 508 cartridges. This tool uses a 3/8" drive end and provides easier assembly and disassembly when servicing specific Öhlins forks. Designed and engineered to be used with the KRT Forks (FF52X), Dynamoto Forks (FGRT 205s), and FKS 508s