The L4V Deadlock is a mechanical deadlock operating independently from the manufacturers’ locking system. It is very similar to the L4V Hook Lock however this lock engages a ‘straight bolt’ (20mm-50mm) into its opposing body section. Operated by its high-security external key under full control of the driver. Suitable for owner-drivers or applications where the driver can be relied upon to operate the lock. The L4V Deadlock is recommended for use on the vehicles cab doors. We may suggest this as an alternative to an L4V Hook Lock where necessary.