Conan paused a moment to study the heavy iron lock.

There was a red-painted iron lock on the door to the corridor; he found the key and locked it.

And I saw the door with its many iron locks.

He shoved open the bar, while the iron locks undid themselves.

It was of stone, not particularly large, with a heavy, blackened iron lock.

There was a neck hole cut in it and a crude iron lock.

We'll also be getting a second set of iron locks on the doors.

He twisted it in the big iron lock on the door.

The case's door was secured by means of an iron lock.