How to use:

• Pass each component through the slot of the base box or the fin box (if it has the US system) and place them next to each other.
• Run the cable-chain through the holes and secure it with a padlock to the car rack, at the beach, or wherever else you want to leave your board unattended.

This way, the two parts together cannot be removed from the box, and you can be at ease. No one will take your surfboard off the rack.