Question about Fischer Xtreme II

The roof box is fitted to the roof bars using a fixing system with metal hooks and clamping levers. Position the 4 fixing mechanisms on the bars, adjust the position of the metal hook, tighten the lever clockwise to secure the hook, lower the lever to lock, and secure the safety clip. Check that everything is tight and that the boot doesn't slip, then pass the luggage straps through the buckles. Detailed assembly instructions are available to download.