Abstract: A protective device for locking two relatively movable objects of a cargo container in a fixed relationship comprises a housing having an open end and a flange extending about the periphery of the open end. The housing is mounted on one of said objects. A longitudinally movable bar is mounted on the interior of housing and extends therethrough for cooperatively engaging a sleeve mounted on the other of the objects for locking the objects together. A collar is also mounted within the housing for enclosing the bar. The collar has a padlock retainer formed between its ends for providing a recess which exposes a hole in the bar when the bar is in cooperative engagement with the sleeve. The recess forms an opening for receiving the shackle of a padlock while the hole is adapted to allow the shackle of the padlock to extend through the bar when the bar engages the sleeve.