The same principal as a deadlock but offering greater security resistance.

Small amount of money extra but better protection.

All keys are the same on the van for each lock apart from Replock

Manufacturer says:

Operated by a high security key, a secondary Mortice lock that acts independently to the manufactureres locking system by throwing a hookbolt into a specially designed keep, enabling optimum vehicle security. A Hooklock operates the same as a Deadlock but a hook is thrown from the lock case which latched onto the keep instead of a solidbolt shooting into the keep. The hook offers greater resistance from the doors being forcibly prised apart when compared to the Deadlock