HiKOKI 6684619 6.3mm Clip for a wide range of compatible HiKOKI and Hitachi petrol-powered garden and engine tools. This replacement retaining clip is used to securely hold compatible components within the machine assembly and is suitable for replacing a worn, damaged or missing original. Manufactured to the correct specifications for precise fit and secure retention. Part 6684619 replaces previous part numbers 680-00731-20 and 6690174.